2008 Kia Rio Repair Question
Kia Rio Engine Problem
please be more specific, any leaking, if so where at? any burning oil? and for a quick test, run the engine at about 3000 rpm, and hold a piece of paper (clean white) near the exhaust pipe for about a minute, if it's dry that's good, if it has an oily black substance on it... well than you blew a head gasket, also check your cooling system, if the car is running to hot it will cause many problems
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If you can't find any leaks, that would mean oil is being burnt in the cylinders or getting to exhaust via the valve seals.
Mileage and year is rather low new for such problems and it could be due to the oil used.
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