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Hi all have a question regarding oil life monitor.  I have new 2500 HD Duramax and have 1200 miles on it.  Yesterday oil life monitor said 83% ,  today I get change oil warnings and it now says 10%.  What should I do?  

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Did anything unusual happen?  I know, at least on past models, GM would drop the oil change to 0% if the engine got over a certain temp, there might be other conditions that would do the same thing, but I assume you would get some kind of notification of a problem.

 

There may be stored codes in one of the computers as well, even if the cel is off.

 

And I totally resisted having you ask your wife where she drove while you were asleep.

Edited by davester
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This like all things is debateable.

What I don't understand about oil changes is they are not expensive and don't hurt a thing.

So " JUST DO IT "

 

:)

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I am happy to get it changed, but why does it change?  This morning it was at 83%, I drove less than 10 miles and this evening it says change oil soon and is at 7%. I thought these new oils were suppose to be better that 1200 mile ranges with no stressful driving at all.

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One thing might be if the truck sat on the dealer lot for close to a year then the OLM is suppose to go down with in that time frame if the mileage isn't met.  It is a guess but I want to say I read that on here at one time.  Is it the new body style?  If so then that isn't the case.   Again, just a guess.  Otherwise like stated above a glitch since there is no other indication of any over temp. 

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On 1/30/2020 at 12:44 AM, mbsfgts said:

Hi all have a question regarding oil life monitor.  I have new 2500 HD Duramax and have 1200 miles on it.  Yesterday oil life monitor said 83% ,  today I get change oil warnings and it now says 10%.  What should I do?  

 

How long have you owned the truck?  How long was it on the dealer's lot before you got it? 

 

More than likely the 1 year timer on the oil life monitor hit and that's why it dropped.  

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  • 2 weeks later...

Any chance you were looking at the fuel filter life at 83% - I don't recall my engine oil showing remaining life until it came on at 10% (I could be wrong here though - just seem to recall that)

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22 hours ago, Stroodle said:

Any chance you were looking at the fuel filter life at 83% - I don't recall my engine oil showing remaining life until it came on at 10% (I could be wrong here though - just seem to recall that)

If you activate that information screen you can also scroll to and view the OLM screen any time. 

 

(all trims can show Remaining Oil Filter %)

 

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No it was oil not filter.  Still seems weird to be 83% one day and 10% the next and then back up the follow day.  I had the oil changed( my 1st and only free one) and everything reset so we will see what happens next.

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The monitor calculates the percent of oil life remaining, based on 3 pathways

The OLM starts its calculation for all pathways after the first 50 miles to account for marshalling and time before sale.  Subsequently, calculations begin immediately after each reset.

Recommendation/Instructions

Oil Life Monitor Calculation Pathways:

1.      Engine revolutions- Oil life starts with a fixed number of revolutions and will decrease with each revolution.  Cold / hot coolant temp readings have multipliers that reduce engine revolutions pathway quicker depending on how far from the normal oil temperature the vehicle is operating.

Note: If engine coolant temp gets above 260F, engine overheat condition, the oil life will go to 0%.

2.      Mileage from last reset – Starting with MY 2013, the OLM is capped at 7500 miles for all GM powertrains except the Volt.  In perfect conditions a vehicle would reach 7500 miles from the last reset and the oil life left would be 0%.

3.      Time- This pathway is a liner function, a fixed decrease in oil life for a given time after the oil life is reset.  The oil life will drop to 0% after 1 year regardless of the amount of engine revolutions or how many miles since the reset.

Note: The Volt uses a 2 year timer instead of 1 year. It also uses the engine revolution counter. It does not use the mileage pathway to count down.   

 

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