Quote:
Originally Posted by markinva
ok, but the "unless your oil is really messed up" part is very important. Also, neither you nor I know for sure how messed up it has to be.
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It certainly is important- especially since the oil can't be visually inspected (unless you pull the oil filter cap).
You said the following was wrong...
"The oil change monitor doesn't evaluate the actual oil life remaining, it just uses the amount of fuel used, engine temps metrics etc"
It doesn't evaluate life...it just tells you when you're turning your engine to metal shavings or are getting a lot of water into your crankcase (e.g. coolant leak, lots of cold driving, blowby, etc.)
I'm not saying the system is worthless- it's very clever. I just wish I knew what sort of engine life they were targeting, what sort of testing backs that up, and what sort of safety factor they have. e.g. in the 80s, Ford thought 60k miles from their FWD automatic transmission was an acceptable design life. In the 90's, when BMW first importated V8s to the US, they quickly failed due to our crappy gas.