grit under oil cap
I have a 1998 Toyota Sienna van with 18k miles. I've had all service done at dealer to maintain warranty. When I looked at the oil filter cap, it was clean, but the baffle inside the valve cover that you pour the oil on top of has a crusty coating of black grit (carbon?). Since the dealer has done all oil changes at 2.5k-4.5k intervals, I don't know how long it's been there. Anybody know what causes this and if it is a problem?
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