internal leak of oil into combustion chamber. Could be a bad head gasket, bad valve seal, or bad cylinder ring. It could also be as bad as block crack.
Disassemble spark plugs one by one to see if there is oil deposit. If so, the valves seal for that cylinder or head gasket around that cylinder is bad; If no oilly spark plug found, it will be very costly repair.
Disassemble spark plugs one by one to see if there is oil deposit. If so, the valves seal for that cylinder or head gasket around that cylinder is bad; If no oilly spark plug found, it will be very costly repair.
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