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Old 11-11-2013, 11:58 AM   #1
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GM Oil Timing of Oil Change system...food for thought

Since my TV is a 2011 Silverado Duramax, I belong to the Duramax forum too. I have always been a stickler for maintaining all my equipment and changed the oil every 3K miles in all my vehicles. With the purchase of my first diesel, and that being a very technology integrated truck, I wanted to get some weigh in from other Dmax owners about this GM Oil Timing of Oil Change system that tells you when to change your oil vs you changing it by mileage. So, I posted a request for comments on the Dmax forum.

HAHA...not surprised at all, the responses were about as varied and sometimes as emotional as our tire and back bumper bike rack discussions on FRF. Anyway, one of the Dmax members pointed us to a 10 year old article basically announcing/describing GM's Oil Life System that began being integrated into their trucks around 2000. It is a very interesting and thought provoking article. I have a friend who has a 2007 Dmax with lots of miles on it and it's still running strong after changing his oil when directed by the GM OLS. Anyway, enjoy the read.

GM's Oil-Life System Improves Timing of Oil Change
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Old 11-11-2013, 12:18 PM   #2
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On my 2005 Silverado I bought I strictly went by the als intervals as I drive minimum of 70 miles a day 5 days a week.
It normally came on at 7-8000 miles in the summer and 5- 6000 miles in the winter.
200k when I traded it and did not uae a drop of oil.

My duramax I change also with the als. Intervals.

My oil guy said todays oils are so advanced that your throwing money away at anything less then 5, 000 miles.
He's an oil man who sells oil telling me this.


Seen that article before but interesting none the less.

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Old 11-11-2013, 12:55 PM   #3
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When I had mine I went by the on board computer's determinations, what good is it paying for and have all that knowledge in the vehicle and then ignoring it. GM put a lot of research into that system and it works great. Also it saves putting all that half used oil into the waste environment system.
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Old 11-11-2013, 02:18 PM   #4
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the thing about the DIC is it is a approxmate,, it has no bearing on condition of filters or oil life, you can install a brand new fuel filter and reset the DIC and tomorrow it can clog up and still read 99%. with that being said I change my oil (rotella T6 ) at 6k miles , and I also do my 3 fuel filters every other oil change, oil change and fuel filter changes are cheap compared to being stranded or replacement of a engine. If you want your diesel to last you got to spend money on it, if you dont want to do that buy a gas engine.. Choices....
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Old 11-11-2013, 02:29 PM   #5
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When I got my first GMC that had the Oil-Life System, I ask the oil changed places about it. They said I should still change oil at 3000 miles. When I bought my 2013 Silverado, I purchased a service program that has 6 years of oil changes included. They base the oil changes at 7500 miles or 20% of oil life. They even track it on Onstar to notify me. So GM must believe the program works. So much for the 3000 mile oil change at the quick lube.
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Old 11-11-2013, 02:41 PM   #6
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Quote:
Originally Posted by jevanb View Post
the thing about the DIC is it is a approxmate,, it has no bearing on condition of filters or oil life.
Actually it does monitor the driving conditions that the vehicle is experiencing, you can see this if you keep track of how the oil life monitor changes, comparing towing and non towing. Or of course you can just decide you know more than GM and do it your way.
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Old 11-11-2013, 03:11 PM   #7
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Not sure how my 2005 made it to 200k using gms dic oil change intervals and still didn't use oil.....
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Old 11-11-2013, 03:14 PM   #8
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As my truck is used mainly for towing and running errands when the DW is at work, I change once a year unless we have taken a longer trip. Even on the low years I still have 10% or more left on the DIC. That said, I have had an annoying oil leak and the dealer has change the oil in this one well before the DIC says as all was under warranty.
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Old 11-11-2013, 04:27 PM   #9
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Had a GM with 240,000 miles and only went by the oil change indicator. Used Synthetic oil and the GM oil filter at every oil change. Truck was always loaded and driven hard most of the time. My son purchased the truck when I got the new work truck and it is still going strong.
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Old 11-11-2013, 10:00 PM   #10
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Starting a thread or conversation about oil change intervals is like starting a conversation with people you don't know about religion or politics.

Diesel or gas, it doesn't matter, 3000 mile oil change intervals only take money out of your pocket and put it in the pockets of the oil change industry. Even if you do it yourself its oil & filter cost plus your time. I know GM has been working on the Oil Life System for at least 25 years. They should have it dialed in by now. I trust it. Mine seems to be accurate when I bounce it against the type of driving I have done. To be really confident in your oil change interval an oil analysis needs to be performed.

By the way, a good friend of mine used to work for GM testing filters. Back i n 1988 he told me GM was being super conservative with an oil change interval of 7500 miles. He stated the filters still had plenty of filter capacity left and the oil was still going strong. Air and fuel filters are another issue.
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