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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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