My car now has 283K on it and I don't see any smoke when driving, however I have noticed I am using about 1/2 litre of oil every 1000 - 1500 miles and if I go down a long hill on overrun when I get to the bottom of the hill and accelerate away I am getting a plume of burnt oil smoke which then clears as I drive off. there is no smoke on tick over and non on start up , any one know which problem I need to address? is it likely to be worn valve stem oil seals or worn piston rings? or something else that ive not though of. I did think PCV at first however there is no hue from dipstick when warm.
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