One would think. BUT....This is what a Google search gives for the GM OLM system:
It doesn't measure oil condition save the highly indirect water temperature. It should measure oil temperature and as we've discussed they are not as closely related as one might assume. The algorithm is based on expected conditions at the end of a certain number of miles or revolutions. And sirs, this estimated value is not tilted in the engines favor. It favors the OEM's bottom line. There are no magical number of miles nor revolutions. No magical time limit. There is only what can be measured directly and only in the broadest of terms would the values used even come close to reality.
It samples nothing. It has no idea where the oil started or where it will finish given the limited values use to create the algorithm. It is just a reminder for the brain dead to do something at some time to keep the warranty in tact. Pure fiction.
Key Factors in Oil Life Calculation
The OLM calculates the remaining oil life percentage based on the following factors:
Factor
Description
Engine Revolutions
Tracks the number of engine revolutions since the last reset, decreasing oil life with use.
Mileage Since Last Reset
Monitors the distance driven since the last oil change, capped at 7,500 miles for most models.
Time Since Reset
Decreases oil life over time, dropping to 0% after one year, regardless of mileage.
Engine Temperature
Adjusts oil life based on coolant temperature; exceeding 260°F sets oil life to 0%.
If I may, I'd like to post my prediction of the trim levels for the 2027 GMC Sierra, based on what was released/introduced today about the Chevy Silverado.
Using the "Professional Grade" wording already in use by GMC, here are the eight (8) trims I believe the Sierra will offer (comparable Chevy trim in parenthesis):
Sierra Pro (Work Truck/WT)
Elevation (Custom)
Elevation Premium -or- Ultimate (Silverado)
AT4 (Custom Trail Boss)
AT4 Premium -or- Ultimate (Trail Boss)
AT4X (ZR2)
Denali (High Country)
Denali Ultimate (N/A)
If GMC would rather simplify the trim levels, then I predict six (6) with package upgrades in parenthesis:
Sierra Pro (with a Graphite package upgrade option)
Elevation (with a Premium -or- Ultimate package upgrade)
AT4 (with a Premium -or- Ultimate package upgrade)
AT4X (with AEV and Ultimate packages upgrade)
Denali
Denali Ultimate
Let's see if I'm close.
I have to believe there are already a bunch of threads on this, but my searches didn't turn up much. While I like the ease of a plugin solution like the Carbyte, It appears it disables the AFM or DFM too, and is not configurable to only disable the auto stop/start. So, I'm looking at the Autostop Eliminator product. I like the idea of it better, but I'm concerned about the install and having to pull so many panels to get it installed. Mines a 2026 work truck, so from what I've read it's a less involved install, but having watched a couple install vid's, I'm still a little intimidated. Might need to buy some plastic trim tools to get it done without breaking or marring stuff. Any experience intalling in a WT greatly appreciated.
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