Oil life

[08grey]

That is actually incorrect. It takes in account for mileage, temperature, speed and a bunch of other algorithms shit to come up with the percentage of oil life left. 7500 might be fairly close but it definitely not just based off of mileage. It's all done through the PCM.

I've had my truck tell me to change the oil relatively soon because of long idle periods n such. Dealer says change it at 20 percent or less. You just have to adapt your own policy you feel comfortable with. Mine is more hey I got nothing doing today. I buy new oil and filter every time I change it. And just shelve it. You never know when a long trip is just gonna pop up.

 

[iamdub]

I always thought the PCM determined the oil life based on temperatures, engine loads, run times, etc. just like AZSCTACO said. As for the 7500-mile interval, I'd say that may be correct as well. For those that don't meet the criteria for an earlier OIC, like Gurrzt, it may default to the 7,500-mile warning . Basically, it's a "7,500 mile OIC unless your engine experiences excess load/temperatures/idling/etc." type thing.

 

[Chetrick87]

I'm just guna change it soon to be safe. I thought that I've read people with over 100k switching from conventional to synthetic have problems. Im going to disable the afm soon too just to avoid future problems. Friend of mine has the same year suburban and he put RoYale purple in his truck as soon as he got it.

 

[Gurrzt]

I always thought the PCM determined the oil life based on temperatures, engine loads, run times, etc. just like AZSCTACO said. As for the 7500-mile interval, I'd say that may be correct as well. For those that don't meet the criteria for an earlier OIC, like Gurrzt, it may default to the 7,500-mile warning . Basically, it's a "7,500 mile OIC unless your engine experiences excess load/temperatures/idling/etc." type thing.

I never thought of that aspect, I do not tow, and most of my driving is freeway with speeds between 65-75 mph.

Thank you for this input.

 

[AZSCTACO]

Good info below......as i said....it's not based off of 7500 miles to reach 0%:



http://assets.cobaltnitra.com/teams...5efa6b30/975c7820afba1004895010145efa6b30.pdf

 

[AZSCTACO]

Straight from the manual :

When to Change Engine Oil
Your vehicle has a computer system that lets you
know when to change the engine oil and filter.
This is based on engine revolutions and engine
temperature, and not on mileage. Based on driving
conditions, the mileage at which an oil change
will be indicated can vary considerably. For the oil
life system to work properly, you must reset the
system every time the oil is changed.

 

[yukon702]

That is actually incorrect. It takes in account for mileage, temperature, speed and a bunch of other algorithms shit to come up with the percentage of oil life left. 7500 might be fairly close but it definitely not just based off of mileage. It's all done through the PCM.

Exactly

 

[the blur]

RPM is factored into OLM. Trailer mode too.