Quote:
Originally Posted by Isaac Zachary
I wonder if you have to pay extra to test for the detergents.
The Prius I got with over 200,000 miles on it apparently has gummed up rings. Although there are a lot of things in the design that contribute this common failure on Toyota engines, from what I can find the problem isn't an issue if you just change the oil every 5,000 miles or sooner which allows the oil to keep those oil control rings clean.
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Not saying I don't believe it, but I'd want to know the method of action that extending change intervals causing gummed up rings or oil passages.
My understanding was the hydrocarbon chains break up as oil is used, making it less viscous over time.
I'm not familiar with the role of detergents to keep the engine clean, though I know it helps with maintaining fuel injection components in gasoline. I've never had an issue with a fuel system either, and I buy the cheapest gas I can find.