: Oil life remaining computation with synthetic oils



packardv8
11-09-12, 01:25 PM
The "oil life remaining" computation on my 2011 3.0 seems to run down quickly. Other cars seem to go many more miles on synthetics before recommending oil changes. One BMW went 12,000 miles.

Anyone seen any recommendations as to why the GM 3.0 algorithm recommends oil changes at 5,000 miles or less?

jack vines

allgm
11-09-12, 02:00 PM
2010 SRX I have been changing at around 25% oil life remaining = around 7500 miles. I have never ran it down to zero but would think 10,000 would be the mileage. All depends on how you drive and the conditions.

stevec5375
11-09-12, 05:19 PM
I have almost 18K miles on my 2010 SRX. I have changed the oil strictly by the meter and I let it run down to 0%. I have had to have it changed twice and I use synthetic. Hope that helps.

doyall
11-09-12, 05:44 PM
... All depends on how you drive and the conditions.

Plus many other factors. (You can't compare the HFV6 powerplant to any BWM engine ... the apples to oranges thing.) Do some searching on other parts of the intertube and you can find more information than you want to know about these GM engines and their associated issues which apparently come into play with the OLM.

Additionally, the OLM doesn't know whether there is synthetic or conventional oil in the pan. I would guess that the algorithm is geared toward GM's ACDelco Dexos1 brand of synthetic blend oil.

I wish my OLM zeroed out at 5,000 miles since Cadillac covers the oil changes on their 2011 models. Hopefully Saab does as well.

packardv8
11-10-12, 12:21 AM
Thanks for the replies.


I wish my OLM zeroed out at 5,000 miles since Cadillac covers the oil changes on their 2011 models. Hopefully Saab does as well. The bad news is Saab doesn't cover anything. The good news is buying it without a warranty, we paid a lot less for it.

jack vines

Caddybill
11-11-12, 12:44 AM
I found after complaining about the long interval when my 2011 Lux was new, the service dept. was able to reset the computer. Now my oil changes are never more than 5000 miles.

stevec5375
11-11-12, 08:34 AM
I found after complaining about the long interval when my 2011 Lux was new, the service dept. was able to reset the computer. Now my oil changes are never more than 5000 miles.

You know you don't have to use the computer's decision about your oil change at all. Just change it when you want to and ignore the display. LOL

doyall
11-11-12, 12:16 PM
FWIW, oil analysis by two independent laboratories fairly well confirmed for me the validity of GM's OLM, at least on my car under my circumstances. And those circumstances included some fairly high fuel dilution to the oil numbers (5% + for the majority of the 6,700 mile interval on the last run). As much as I despise running oil that smells like gasoline, it appears as though it hasn't done any damage *yet* although iron was tagged as being on the high side (possibly due to engine still going through wear-in). I am trying to hold out for the duration on this interval as I don't want to unnecessarily waste resources and spend money needlessly. (I have just sent off a sample for analysis at 50% on the OLM at 3,600 miles, mostly in summer operation.) Under the right circumstances, 7,000 miles does not seem out of the realm of reason. I wouldn't try it on conventional oil, however.

stevec5375
11-11-12, 02:54 PM
FWIW, oil analysis by two independent laboratories fairly well confirmed for me the validity of GM's OLM, at least on my car under my circumstances. And those circumstances included some fairly high fuel dilution to the oil numbers (5% + for the majority of the 6,700 mile interval on the last run). As much as I despise running oil that smells like gasoline, it appears as though it hasn't done any damage *yet* although iron was tagged as being on the high side (possibly due to engine still going through wear-in). I am trying to hold out for the duration on this interval as I don't want to unnecessarily waste resources and spend money needlessly. (I have just sent off a sample for analysis at 50% on the OLM at 3,600 miles, mostly in summer operation.) Under the right circumstances, 7,000 miles does not seem out of the realm of reason. I wouldn't try it on conventional oil, however.

I take my car to the dealer for oil changes when the meter hits 0% and get the synthetic oil. I have a 2010 model so I have to pay out of pocket for this. I figure if the car has engine problems due to oil changes, then it's GM's fault and not mine since I'm doing it "by the book".

Marc NY
11-11-12, 05:34 PM
The only problem I see with waiting to go to the dealer at 0% is the dealer able to determine how long you been driving at 0%??? If you keep your OnStar account active I believe you would be OK... but if you don't then how are they going to determine that you are one day or one month or a year driving at ZERO%?

doyall
11-11-12, 06:32 PM
... I figure if the car has engine problems due to oil changes, then it's GM's fault and not mine since I'm doing it "by the book".

Not an unreasonable approach - as long as it is still under warranty. As my wife and I tend to drive vehicles well beyond warranty expiration, I certainly am concerned about engine longevity and hope that GM's algorithm doesn't result in early (six to ten year) retirements.

inspectorudy
11-11-12, 09:55 PM
Doyall if I were you I would get the extended warranty that covers everything that the OEM warranty covers. It sounds like you will need it if you are going to drive this thing after the OEM warranty expires. Just ONE electrical problem, like replacing one of the many computers, will pay for the extended warranty. If it is the engine then you will be really in the hole. If our cars were Yougos then it wouldn't matter because they are so simple to work on but with our rolling computers everything they touch will be expensive after the warranty runs out. IMHO.

stevec5375
11-11-12, 10:09 PM
The only problem I see with waiting to go to the dealer at 0% is the dealer able to determine how long you been driving at 0%??? If you keep your OnStar account active I believe you would be OK... but if you don't then how are they going to determine that you are one day or one month or a year driving at ZERO%?

When the reading is about 5% I make the oil change appt about three days out and by then it's hit 0%. And yes, my OnStar acct is active.

GMJim
11-12-12, 11:12 AM
Your 2011 should be running DEXOS synthetic blend oil. I have found that the oil life has been cut nearly in half, compared to Mobil1.

kiboater
11-12-12, 01:08 PM
Your 2011 should be running DEXOS synthetic blend oil. I have found that the oil life has been cut nearly in half, compared to Mobil1.

Do you mean that the Dexos only gives half the life of Mobile 1? Is this based on oil analysis? If not what are you using to determine this?

allgm
11-12-12, 03:55 PM
Mobile one is full synthetic vs dexos is a blend not full synthetic. It does not take a scientist to figure this out.

doyall
11-12-12, 10:55 PM
Mobile one is full synthetic vs dexos is a blend not full synthetic. It does not take a scientist to figure this out.

I'm sure that a chemical engineer might disagree with that.

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Doyall if I were you I would get the extended warranty ...

If we do decide to keep the car longer term I feel confident that will be a must have.

Caddybill
11-12-12, 11:28 PM
You know you don't have to use the computer's decision about your oil change at all. Just change it when you want to and ignore the display. LOL

Yes you can change oil anytime you want, but the 2011 models cover the cost of the service for the first 50000 miles. Our dealer will do this when the OLM is 20% or less.LOL

GGMiv
11-13-12, 08:36 PM
Mobile one is full synthetic vs dexos is a blend not full synthetic. It does not take a scientist to figure this out.

Dexos is a standard not a brand. It replaces GMStandard GM4718M. The Dexos oil that dealers use in 2011 and beyond in the free maintenance program is a blend. All of the Mobil1 oil that I have bought lately to keep our 2008 full meets the Dexos standard. I would prefer full synthetic in our 2011, but accept the blend they use. We aren't planning on keeping the 2011 past the warranty. I do top it off with full synthetic when it needs it because I have to keep it on hand for the thirsty '08 V6.

Ponyman
11-13-12, 09:22 PM
We ran ours to 0% the last time. We were off in Arkansas at our vacation home, and just had to livewith it till we got back home. I have mentioned this before, ours is a 10, but our dealer is changing the oil and rotating the tires for free, and it is NOT the dealer we bought it from. Makes my brother in law mad, he also has a 10 and is having to pay for his oil changes.