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2006 CTS
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I just returned from my first road trip with my '06 CTS that I purchased earlier this year as a pre-owned vehicle. The car has just over 42,000 miles on it and the engine is the 3.6 litre.

Over the course of a 1100 mile trip, the vehicle consumed almost 2 quarts of oil. Granted some of trip involved some hard driving (i.e. temperatures in the lower 90's, stop and go traffic on the tollways around Chicago, etc.), but this amount of oil consumption seems a bit excessive. Hell, I've got a Chevy Blazer with almost 140,000 miles on it that didn't use a drop over the course of a recent 700 mile round trip.

The vehicle is still on warranty. Do I have a warranty issue, or am I just overly concerned?

Thanks for any help with this.
 

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2003 CTS "Ebony Maria" 2005 Cadillac STS "Grace"
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6,414 Posts
if it is still under warranty, take it in...i dont think you are being overly concerned, i think you have a problem like some other people on this forum
 

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Oil consumption is an issue that is going to bring out as many different opinions in this thread as there are posts. Good luck.
 

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2004 3.6 auto
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140 Posts
Boy - GM really pisses me off everytime I read a thread like Mark's.

Mark - I feel your pain. When I bought my 2004 3.6 with 55k miles, I was getting 800/qt. Yours is the worst I've heard so far - 600/qt. This is such B.S. !!!

I just read on the internet that GM is going to split into an "old" and "new" GM and the "new" GM is not going to deal with "old" problems. You may want to scan the web for this sort of talk.

Absolutely get your car in and have those SOB's to get you a new engine under warranty ! Lord knows how long an "old" warranty will be valid !

I have since gotten my consumption reduced to about 1250 miles/qt by doing the Auto-Rx treatment. If you want more details, search on my "3600cc" id. I do NOT suggest you do this though - you should get a new engine from those GM bast%^&s!

I always wondered if there's a correlation between my poorly-sealed airbox letting dirt in, and the bad oil consumption. If you feel like spending 20 minutes and getting your hands dirty, maybe you want to take a look at yours.

Best of Luck !
 

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I just read on the internet that GM is going to split into an "old" and "new" GM and the "new" GM is not going to deal with "old" problems. You may want to scan the web for this sort of talk.
It's a good thing I believe everything I read on the internet.
 

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2004 3.6 auto
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Jimmy.

I understand your skepticism, but this seems legit to me.

This is only the first article I've found.

I just wouldn't want to folks to drag their feet too long before getting GM to do the right thing for them - just trying to help...

http://www.autoblog.com/tag/old+gm/
 

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03 CTS 3.2L (Sold) / 09 CBR 600rr /2014 GMC Sierra
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My 2002 jimmy has 185,000km on her, origional motor, and it doesn't burn any oil at all...those 4.3L are bulletproof!!!
I have heard a lot about oil consumption with caddy motors, especially the 3.6 and the northstar V8 in the deville...deville is the worst.
Take it in and get it replaced...don't let stuff like this drag on.
 

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2003 CTS Manual Trans
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39 Posts
Here is GM's official guideline for Techs to determine if oil consumption is too high. Thought I would share it with the community. Each case is obviously handled seperatly, but this will give you an idea on what the dealership will look at...

#01-06-01-011F: Information on Engine Oil Consumption Guidelines - (Jan 13, 2009)

Subject: Information on Engine Oil Consumption Guidelines

Models: 2009 and Prior GM Passenger Cars and Gasoline-Powered Light Duty Trucks Under 8500 LB GVW (Including Saturn)
2009 and Prior HUMMER H2, H3
2009 and Prior Saab 9-7X

This bulletin is being revised to update the warranty information on vehicles and add model years. Please discard Corporate Bulletin Number 01-06-01-011E (Section 06 -- Engine/Propulsion System).

All engines require oil to lubricate and protect the load bearing and internal moving parts from wear including cylinder walls, pistons and piston rings. When a piston moves down its cylinder, a thin film of oil is left on the cylinder wall. During the power stroke, part of this oil layer is consumed in the combustion process. As a result, varying rates of oil consumption are accepted as normal in all engines.
Oil Consumption

The accepted rate of oil consumption for engines used in the vehicles referenced is 0.946 liter (1 qt) in 3200 km (2000 mi).

Important: This rate only applies to personal use vehicles, under warranty, that are driven in a non-aggressive manner and maintained in accordance with the appropriate maintenance schedule, with less than 58,000 km (36,000 mi), or driven at legal speeds in an unloaded (for trucks) condition.

Important: This rate does not apply to vehicles that are driven in an aggressive manner, at high RPM, high speeds, or in a loaded condition (for trucks). Oil consumption for vehicles driven under these conditions will be more.

Many factors can affect a customer's concern with oil consumption. Driving habits and vehicle maintenance vary from owner to owner. Thoroughly evaluate each case before deciding whether the vehicle in question has abnormal engine oil consumption.
Gasket and External Leaks

Inspect the oil pan and engine covers for leakage due to over-tightened, damaged, or out of place gaskets. Inspect oil lines and fittings for signs of leakage.
Improper Reading of the Oil Level Indicator (Dipstick)

Verify that the dipstick tube is fully seated in the block. When checking the oil level, make sure the dipstick is wiped clean before taking an oil level reading and fully depress the dipstick until the shoulder bottoms out on the dipstick tube. The dipstick should be the proper part number for the engine/vehicle that is being checked.

Notice: Operating your vehicle with an oil level that is below the minimum level indicated on the engine oil dipstick can result in severe engine damage. Repairs resulting from operating an engine with insufficient oil are not covered under the terms of the New Vehicle Warranty.

Important: Refer to Owner Manual in SI for checking and adding engine oil.
Not Waiting Long Enough After Running Engine to Check Oil Level

Some engines require more time than others for the oil to drain back into the crankcase. To assure a sufficient amount of oil has drained back to the crankcase, and an accurate reading can be obtained, the vehicle should be allowed to sit for at least 15 minutes, after the engine has been shut off, before taking an oil level reading. In order to ensure accurate results, the temperature of the oil should be close to the same temperature as the last time the oil level was checked.

Important: This does not apply to 2006-2009 Corvette Z06 equipped with the 7.0L LS7 and the 2009 Corvette ZR-1 with the 6.2L LS9 engines (dry sump). Follow the instructions in the Owner Manual for checking the oil in this application.
Improper Oil Fill After an Oil Change

Following an oil change, verify that the proper amount and type of oil was put in the engine and that the oil level on the dipstick is not above the full mark or below the add marks. Refer to the Owner Manual or Service Manual for information on recommended oil quantity, viscosity, and quality.
Aggressive Driving, High Speed or High RPM Driving

Aggressive driving and/or continuous driving at high speeds/high RPMs will increase oil consumption. Because this may not always be an everyday occurrence, it is hard to determine exactly how much the oil economy will be affected.

A higher rate of oil consumption is normal for vehicles equipped with manual transmissions that are driven aggressively. By "aggressive," we mean operation at high RPM (3,000 RPM to redline), with frequent use of engine braking (using the engine to slow the vehicle). Vehicles that are driven aggressively may consume engine oil at a rate of up to 0.946 L (1 quart) every 805 km (500 mi). This is normal for a vehicle that is driven aggressively. No repair is necessary. This characteristic does, however, require the owner to check the engine oil level at sufficiently frequent intervals, especially when driving aggressively, to assure the oil level remains within the recommended operating range. As the Owner’s Manual recommends, you should check the oil level every time you get fuel.
Towing or Heavy Usage

Towing a trailer will increase oil consumption and may cause oil consumption to fall below the normal accepted rate referenced in this bulletin for an unloaded vehicle in a personal use application. Large frontal area trailers will further increase the work required from the engine, especially at highway speeds, and thus increases the rate of oil consumption.
Crankcase Ventilation System

Verify that the positive crankcase ventilation (PCV) system is operating properly. Blockages, restrictions, or damage to the PCV system can result in increased oil use.
Oil Dilution (Fuel and Water)

On vehicles that are usually driven short distances, less than 8 km (5 mi), especially in colder weather, unburned fuel and condensation generated from cold engine operation may not get hot enough to evaporate out of the oil. When this occurs, the dipstick may indicate that the oil level is over-full. Subsequent driving on a trip of sufficient length to enable normal engine operating temperature for 30 minutes or more, in order to vaporize excess moisture and fuel, may give the customer the impression of excessive oil consumption.
Engine Temperature

If an engine is run at overheated temperatures (see Owner's Manual or Service Manual) for more than brief periods, oil will oxidize at a faster than normal rate. In addition, gaskets may distort, piston rings may stick, and excessive wear may result. Verify that all cooling system components are in proper working order.
Engine Wear

Piston scuffing, excessive piston-to-wall clearance, tapered or out of round cylinders, worn, damaged or improperly installed valve guides, seals and piston rings will all cause an increase in oil consumption.
Measurement of Oil Consumption

Engines require a period of time to BREAK IN so that moving parts are properly seated. Therefore, oil economy should not be tested until the vehicle has accumulated at least 6400 km (4000 mi). An exception would be allowed only if an engine is reported to be using more than 0.946 liter (1 qt) in 1600 km (1000 mi).

1. Verify that the engine has no external leaks. Repair as necessary.
2. Verify that the engine is at normal operating temperature (see Owner's Manual or Service Manual).
3. Park the vehicle on a level surface.
4. Wait at least 15 minutes, after the engine is shut off, before checking the oil level to make sure that the oil has had time to drain back into the crankcase.
5. Verify that the oil level is at, but not above, the full mark on the dipstick, and that the proper viscosity and quality oil are being used as recommended in the Owner's Manual.
6. Record the vehicle mileage, date, and exact oil level on the form included in this bulletin.
7. Ask the customer to verify the oil level, each time the vehicle is fueled, following steps 1-6 and return the vehicle to the dealership if the oil level is found at or below the add mark, 0.946 liter (1 qt) low. If the oil level remains above the add mark, the customer should continue to operate the vehicle and verify the engine oil level until 3200 km (2000 mi) has accumulated before returning to the dealership for a final evaluation.
8. If the final evaluation shows that the engine uses more than 0.946 liter (1 qt) in 3200 km (2000 mi), follow the published symptom diagnostics as described in the appropriate Service Manual. If the oil consumption test shows that the engine uses less than 0.946 liter (1 qt) in 3200 km (2000 mi), explain to the customer that their engine meets the guidelines for oil consumption.
 

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2003 CTS Manual Trans
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In addition to the generic info in the above post, here is a specific guideline for the 3.6.

#PIP4439: HFV6 Oil Consumption - keywords 2.8 3.6 rings seal smoke valve - (Jul 23, 2008)

Subject: HFV6 Oil Consumption

Models: 2004-2007 Buick Rendezvous,
2005-2008 Buick Lacrosse, Allure
2008 Buick Enclave
2004-2008 Cadillac CTS, STS, SRX
2008 Chevrolet Malibu, Equinox
2008 GMC Acadia
2007-2008 Pontiac G6
2008 Pontiac G8, Torrent
2007-2008 Saturn Aura, Outlook
2008 Saturn Vue
with LP1 2.8L, LY7 3.6L, or LLT 3.6L V6 engine

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:

Some customers may comment of excess engine oil consumption.
Recommendation/Instructions:

Verify the oil consumption concern following bulletin 01-06-01-011D. In addition, check the engine air filter and replace the air filter element as necessary. Care must be taken to ensure that the air filter and air filter box are reassembled correctly so that the filter and air box seal and prevent foreign particles from bypassing the filter. Check for signs of foreign particles bypassing the filter and getting into the engine, such as dust or dirt in the air intake duct or on the throttle body. If dust or dirt is found, look for the source of the leak, such as incorrectly assembled air filter/air filter box, loose clamps or incorrectly assembled joints at the air duct, leaking sensor gaskets, damaged duct parts, etc. and correct as necessary.

If oil consumption is in excess of the guidelines in bulletin 01-06-01-011D, replace the piston rings and valve seals.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
 

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2016 CTS4 Black
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Dan_W - Thanks for that post. :thumbsup:

My 2006 is averaging 1qt per 1100 miles with 39k miles on the odometer. It looks like I'll be having a meeting with my Cadillac dealer.
 

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2003 CTS Manual Trans
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Dan_W - Thanks for that post. :thumbsup:

My 2006 is averaging 1qt per 1100 miles with 39k miles on the odometer. It looks like I'll be having a meeting with my Cadillac dealer.
When you take your vehicle in, keep these things in mind. I would not necissarily refer to this bulletin when you take it in, simply state that you have been keeping track of oil consumption and give them your findings. Dealerships seem to dislike web forums as they are commonly misinformed. Often times people think they will get xxxx if they simply go in and talk about a bulletin and how it applies to their vehicle.

Personally I don't think there should be any measurable oil consumption if a vehicle is running and maintained properly, but that is just my own thought, so take it with a grain of salt.

..."Important: This rate only applies to personal use vehicles, under warranty, that are driven in a non-aggressive manner and maintained in accordance with the appropriate maintenance schedule, with less than 58,000 km (36,000 mi), or driven at legal speeds in an unloaded (for trucks) condition..."

..."Aggressive driving and/or continuous driving at high speeds/high RPMs will increase oil consumption. Because this may not always be an everyday occurrence, it is hard to determine exactly how much the oil economy will be affected.

A higher rate of oil consumption is normal for vehicles equipped with manual transmissions that are driven aggressively. By "aggressive," we mean operation at high RPM (3,000 RPM to redline), with frequent use of engine braking (using the engine to slow the vehicle). Vehicles that are driven aggressively may consume engine oil at a rate of up to 0.946 L (1 quart) every 805 km (500 mi). This is normal for a vehicle that is driven aggressively. No repair is necessary. This characteristic does, however, require the owner to check the engine oil level at sufficiently frequent intervals, especially when driving aggressively, to assure the oil level remains within the recommended operating range. As the Owner’s Manual recommends, you should check the oil level every time you get fuel..."
 

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2005 Cadillac CTS 3.6L VVT
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Depends on a lot of things but since your car is under warranty, take it to the dealer.

My 05, 3.6l with mobil 1 5w30 used to drink 1 qt per 4k-6k miles depending of my driving habits.

Then, I switched to M1 10w30 which my car didn't like at all. 1 qt per 800 miles.

I switched to PP 5w30 and I'm now using 1 qt per 2500 miles-3500 miles and it gets better slowly.

BTW, my car is my office so from 6 or 7 a.m til 4 or 5 p.m, my car is almost running the entire time. If my trunk is fully loaded with products that weight about 300lbs, my car tends to consumme more and its normal. During business trip like 800-1000 miles at a time, non-stop, my car tends to consume a little bit more. City driving only, it consumes.

At every fill up, I check my oil level so I dont have any surprise. My 05 has the low oil level indicator but it triggers only at the "on" position with the engine off and only if there's 2.5l oil left or less (I did some tests) so dont count on that solution to tells you you're missing oil.
 

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I had an '05 6MT, and at 50K started to run through a quart every 500 - 1,000 miles. I always kept a quart in my car for addition. It always seemed to be low when I got it back from oil changes! I will be the first to admit I drove it aggressively. But, I still thought the oil consumption seemed excessive. But, I didn't notice any sudden loss of acceleration or power at that point.

It didn't scare me off enough to get another CTS 6MT. Just picked it up last week.
 

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Cadillac
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WARRANTY WILL BE WARRANTY! plain and simple old and new gm dont matter. there is an oil consumption issue on this vehicle and gm has addressed it and will continue. my shop has done many of these repairs and will continue to do so with great success. if your dealer wont help you...bring it down to me
 

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i changed my oil and bam it stopped using oil. I don't get this. I also feel that there is something to waiting. Like I put oil in my car and the level doesnt change.

I was pretty fearful of overfilling since I never saw the level change when I added more. Its like I couldnt get the car over the half way mark on the dipstick.

Wait and see before you stop filling the first time.

ps just checked it. practically zero oil consumption at 3000 miles now, oil looks very clean... i seriously dont get it.. one thing I did before was use ring free a oil change ago. i just used mobile 1...

I think the best way is to seafoam your car. But I am befuddled... maybe the Rislone Compression repair (with ring seal) i put in(only put in half a bottle) worked???? I mean the stuff is out of my engine.

http://www.barsproducts.com/4444.htm Its thick like cold honey.

Someone else try this. I put a fair amount of miles once I put this in, I had to add oil. Next oil change is staying put now...

there is also this

http://www.barsproducts.com/4416.htm
 

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2005 CTS-V
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I have an '05 3.6 manual and I will go through 4-5 quarts before the Oil Life counted down.
I have not had the car all that long so I just started keeping track of the mileage.
I rarely see anything past 4K rpms and the car has no smoke or unusual noises either...

I have 77% Oil Life left with about 1,800-2k miles since I changed it last. I put half a quart in it already and I just checked and I need almost 3 quarts right now.

I have been thinking this is unusal but was unsure of my warranty since I bought it used.

Does anyone know the general GM warranty that may apply?
(ie: 60,000 mile powertrain)
 

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2016 CTS4 Black
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i changed my oil and bam it stopped using oil. I don't get this. I also feel that there is something to waiting. Like I put oil in my car and the level doesnt change.

I was pretty fearful of overfilling since I never saw the level change when I added more. Its like I couldnt get the car over the half way mark on the dipstick.

Wait and see before you stop filling the first time.

ps just checked it. practically zero oil consumption at 3000 miles now, oil looks very clean... i seriously dont get it.. one thing I did before was use ring free a oil change ago. i just used mobile 1...

I think the best way is to seafoam your car. But I am befuddled... maybe the Rislone Compression repair (with ring seal) i put in(only put in half a bottle) worked???? I mean the stuff is out of my engine.

http://www.barsproducts.com/4444.htm Its thick like cold honey.

Someone else try this. I put a fair amount of miles once I put this in, I had to add oil. Next oil change is staying put now...

there is also this

http://www.barsproducts.com/4416.htm
That Bar's stuff looks promising. Anyone else have any experience with it?
 

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CTS
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I have been driving around 20,000 miles a year for 25+ years now. I have never owned a car that burned any oil between changes. If you are losing oil it is a sign of more serious issues that need addressing.
 

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2005 CTS-V
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112 Posts
Where is it all going if it doesn't burn it, doesn't leak it and theres no residue in the intake area?
 
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