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Discussion Starter #1
It uses more than 1quart every 1k miles, and at $6 bucks sinthetic, I was thinking about switching to a non synthetic oil.. maybe a synthetic blend?
what would be the best recomendation from you guys?
also, switching from 5-30 to a higher grade like 10-40 or 10-30 would help with the oil burning consumption?
thank you.
 

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2005 Escalade 6.0L 2WD, 2007 Jeep Grand Cherokee Limited CRD
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Cadillac recommends regular oil for the Northstar engines. The only ones that it recommends synthetic is for the VVT engines.
 

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The Northstar Tuner
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Subject: Gasoline Engine Maintenance Information - American Petroleum Institute GF-4 Oil - All 05 General Motors Cars and Light Duty Trucks with Gasoline Engines - kw API change filter lubrication #PIP3186 - (10/13/2004)



Models: .




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The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:
Some customers may have questions regarding a new gasoline engine oil standard, GF-4.

Recommendation/Instructions:
GF-4 is an industry test standard for gasoline engine oils that stands for "Gasoline Fueled - 4". GF-1 test standards were implemented in 1993 and GF-4 test standards will take the place of the current GF-3 test standards on April 30, 2005. GF-4 oils meet a higher test standard to provide improved deposit protection, oxidation resistance, fuel economy, oil life and catalyst protection. At this time, AC Delco Oils that are sold in Canada already meet GF-4 quality standards while AC Delco Oils sold in the U.S.A. should meet GF-4 quality standards by the end of 2004. General Motors Engine Assembly Plants are in the process of converting to oils that meet GF-4 quality standards. Some of the major oil companies have already upgraded their 5W-30 oil to meet GF-4 quality standards but some 10W-30 oils may not be upgraded until April of 2005. The whole oil industry is scheduled to meet GF-4 oil standards by April 30, 2005.

The change from GF-3 to GF-4 quality standards should be transparent to our customers since the owner's manual oil recommendation will continue to recommend the use of oil with the API (American Petroleum Institute) "Starburst" symbol. GM owner's manuals have recommended using oils with the API "Starburst" symbol since the early 1990s and will continue to do so once GF-4 has been implemented. To determine how to identify the API "Starburst" symbol, please refer to the owner's manual of the vehicle. Oils that are manufactured after April 30, 2005 with the API "Starburst" symbol, will meet GF-4 quality standards. Oils that contain the API "Starburst" symbol that are manufactured before this date, may meet GF-3 or GF-4 quality standards depending on the oil manufacturer. Starting on April 30, 2005, all 0W-20, 5W-20, 0W-30, 5W-30 and 10W-30 oils with the "Starburst" symbol will automatically meet the GF-4 quality standard and have an API rating of SM. Note: GF-4 oils can be used in older vehicles where GF-3 or earlier quality standard oils were used. The oils can also be mixed with each other.

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Please follow this diagnosis 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. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

Models:
(05 General Motors Cars with a Gasoline Engine) and (05 General Motors Trucks with a Gasoline Engine)

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GM Approved Engine Oils Update


An updated version of the GM6094M Approved Engine Oils list is available in the Reference Guide section of the TechLink website. GM has recently conducted a test program to check several of the oils on the Approved Oils list for compliance with the GM6094M specification. One of the oils tested during this program, Castrol GTX, was found not to meet the GM6094M specification, and so this oil has been removed from the Approved Oils list.

Watch for further updates to the GM6094M and GM4718M Approved Products list on the GM Techlink website.
 

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Discussion Starter #4
The engine and the manual states that Synthetic oil is required..
if I switch to non synthetic.. what would be the best?
motorcraft semi is cheap..
and thanks for your prompt responses...
 

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2005 Escalade 6.0L 2WD, 2007 Jeep Grand Cherokee Limited CRD
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The engine and the manual states that Synthetic oil is required..
if I switch to non synthetic.. what would be the best?
motorcraft semi is cheap..
and thanks for your prompt responses...
Neither the engine or the manual states you must use synthetic oil on a 2000 Northstar. What page are you reading that in the manual?
 

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95 Fleetwood Brougham / 01 DTS / 11 CTS Lux / 11 DTS Platinum
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7,085 Posts
Where are you reading that because unless it's a new VVT Northstar, that information is incorrect. Show us please. Additionally, more than 1 qt per 1000 miles is out of spec and the leak should be repaired.

10W-30 is the recomened weight. 5W-30 if you're in sustained temps below 0 degrees F. Do Not use 10W-40

The engine and the manual states that Synthetic oil is required..
if I switch to non synthetic.. what would be the best?
motorcraft semi is cheap..
and thanks for your prompt responses...
 

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White Diamond 2001 STS
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1,317 Posts
Synthetic oil is NOT required for your engine, unless it's in a RWD car (like an XLR or SRX or new STS).

What year is your car/engine?

93-99, use 10W-30.
00+ (FWD), use 5W-30.

Brand of oil is your choice. Doesn't matter. All are fine. Most people do NOT use synthetic oils in their engines. And most run fine for hundreds of thousands of miles.
 

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1996 Cadillac Seville STS (167k)
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if you have been putting in synthetic oil can you switch back to conventional oil without harming the engine?
 

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White Diamond '03 DHS (with DTS floor shift)
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You'll be fine with 10W30. That is all I use. Everyone else has already addressed the synthetic issue.
 

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2000 Eldorado ESC
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One of the oils tested during this program, Castrol GTX, was found not to meet the GM6094M specification, and so this oil has been removed from the Approved Oils list.

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Brand of oil is your choice. Doesn't matter. All are fine. Most people do NOT use synthetic oils in their engines. And most run fine for hundreds of thousands of miles.



Except for Castrol GTX
 

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95 Fleetwood Brougham / 01 DTS / 11 CTS Lux / 11 DTS Platinum
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Me too. 5W-30 is only necessary if you're in sub zero for long periods of time.

You'll be fine with 10W30. That is all I use. Everyone else has already addressed the synthetic issue.
 

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White Diamond 2001 STS
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Me too. 5W-30 is only necessary if you're in sub zero for long periods of time.
I agree, I'm just listing what Cadillac recommends (since that seemed to get confused earlier in this thread).

I'm using Shell Rotella 10W-30 in mine right now.
 

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White Diamond 2001 STS
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