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I suspect my piston rings are worn because I use a lot of oil (1 litre per 400-500 miles) and the car occasionally smokes on startup. I don’t want to go down the route of an engine rebuild or engine swap. My question is what oil should I change to and what brand? Also since the car uses so much oil anyway, should I skip the oil change and just stick to changing the oil filter instead?
 

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You can run it on 5w40 if you are not already doing so?
Have you replaced the CCV? When faulty these can cause excessive oil usage
 
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