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Change Engine Oil

renolaw

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renolaw Enthusiast

renolaw

Posted
Posted

Changed the oil in the 8.1 under regular maintenance. After the change, the "change enging oil" light comes on briefly after start up. I'm aware of the process to cxl the light, but why would it come AFTER i changed the oil?

 

just wondering...

 

mb

Freyguy Enthusiast

Freyguy

Posted
Posted

My theory is that there is no reasoning behind that light. I believe that it comes on at set intervals even though GM says that it monitors the oil quality. If it was a dang light bulb I would take it out! :D:cool:

USA1Fan Enthusiast

USA1Fan

Posted
Posted

The Oil Life System doesn't actually look at the oil at all. It monitors engine conditions (speed, etc.) and adjusts a countdown from 100% to 0% based on those conditions (ie.- harder driving / higher RPMs or short trips without time for the engine to fully warm up result in the countdown running out in less miles). Basically it takes into account the same things we used to when we looked at the manual's recommended maintenance intervals (driving conditions, engine rpm, engine temperature) and automatically adjusts its rate of countdown.

 

If you change the oil before the Oil Life System reaches the 0% point but don't reset the system, it has no way of knowing the oil is new. So the countdown continues and it alerts you when it hits 0 (or whatever percent they've preset. Haven't hit mine yet on my truck :D).

 

If you plan to pay attention to the Oil Life System then you need to follow the procedure in your manual for your particular vehicle to reset it whenever you change to oil.

Shawn T Enthusiast

Shawn T

Posted
Posted

The oil life moniter does not know if you change the oil or not. I does not technically moniter the oil itself, rather the engine rpm and accumulated mileage since the last reset. The moniter is a guideline to changing your oil. Some people follow it, some just ignore it and reset it at every oil change so they do not get what you are experiencing. For example, if you change to synthetic, the OLM is unaware that it's thermal breakdown is much less than conventional. It is all relative, a good reminder for people who do not regularly change their oil. In my case just something to reset every 3000 miles. :D

Shawn T Enthusiast

Shawn T

Posted
Posted

USA1fan

We posted at the same time, sorry for the echo.

Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted

If you change your oil before the light comes on you have to still go threw the reset sequence even though the light is not on to reset the count down process or the light may come on soon after you change the oil and like above comments the oil monitor system doesnt know when you changed the oil.

Bgdsub72 Enthusiast

Bgdsub72

Posted
Posted

I just reset my oil life on my DIC when ever I change my oil. The way to reset the Oil life % is to have the truck in the on position (the one right before start) and push the accelerator 3 times. The percentage will reset back to 100%

jeb Enthusiast

jeb

Posted
Posted

I don't pay any attention to the GM oil life system. I do reset it when I do my oil changes just so the light doesn't pop on when I'm driving and aggravate me. But the monitor system does not take things into account like towing, driving in dusty conditions, etc which have an impact on your oil life. I just change it every 5k and call it good.

Scyry Enthusiast

Scyry

Posted
Posted
I just reset my oil life on my DIC when ever I change my oil.  The way to reset the Oil life % is to have the truck in the on position (the one right before start) and push the accelerator 3 times.  The percentage will reset back to 100%

 

 

 

 

Is that the same technique for the 2001-2002 models? I can't find my book on the truck, and forget the right way to reset it. I thought I tried what you said above, my Dad's '03 you reset it with the DIC, but mine doesn't have that.

Colorado Kid Enthusiast

Colorado Kid

Posted
Posted

Yup, that was the drill on my '02 and it's still the same on my '04 since I don't have the steering wheel buttons. Engine off, switch on, depress and release throttle pedal 3 time (all the way down and all the way up) within 5 seconds and in the '02 and earlier the pretty amber "Change Engine Oil" light will flash to let you know you got it right. In the '03s and newer the DIC will display "Oil Life Reset" or something similar to that.

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