GM's OLM (Oil Life Monitor) System

WarmAndSCSI

It's a bunch of BS. Any system that provides advice based upon anything but empirical data is a waste.

The only way to tell when you "should" be doing oil changes is by doing a UOA every single change.

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Matt

From what I've read, many people believe that the engineers that designed this system is pretty much an ongoing, dynamic UOA that changes along with your driving habits.

Of course, many believe it's ******** as well, haha. My friend changes his oil every 3,000 miles whether the OLM reads 10% or 90%.

Me? I'm going to see how the OLM reads my own driving habits first. If it routinely has me changing the oil every 2-4000 miles, I may lose faith in it, especially if a UOA proves I could be going longer.

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"Any man who can drive a 370z while kissing a pretty girl is simply not giving the Z the attention it deserves." Albert Einstein....modified.

ChrisSlicks

The problem with the GM/Ford calculations is that it doesn't know what kind of oil how have in there. Dyno and synthetic result in the same OLM numbers.

The GM system will typically have you go 5000-7000 miles before the OLM states you need an oil change.

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