But with leaky valve-stem seals, oil seeps into the combustion chamber from above and quickly burns off when the motor is started. Turn the engine off, and the cycle starts again.

See More Service Bulletins Corrective action: Dealers will replace the valve stem seals. Warranty info: This repair is being covered under the new-car or extended warranty, whichever is applicable.

A. Thinking positively, you might have worn valve stem seals, which will be your cheapest fix. But if your valve guides are worn, your cylinder head must be removed and serviced. The bad news is ...