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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21624
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I recently bought a nissan qashcai petrol 2litre car with approx

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i recently bought a nissan qashcai petrol 2litre car with approx 48000 miles on the clock.i have had the car back to the nissan dealer 5times because it is using oil,the ammount of oil used over a 5month period is approx 3.5 to 4litres.the technition at the dealer has sead qashcais deo not use oil.having checked everything out they cannot find any leaks and they do not know where it is the moment they are checking the car every 6weeks or sotosee how much oil is being used,they say are checking this for nissannas you can imagine i am not happy and would like some answers asap can you help please.
Submitted: 1 year ago.
Category: Car
Expert:  Matt replied 1 year ago.
The first thing I'd check is the crankcase pressure relief valve (PCV) these are sprung loaded and are only meant to 'burp' excess pressure every now and then. The exiting gas is piped back to the inlet, however should the valve stick open then the engine tends to suck the air out of the crankcase all the time and this carries oil over with it. If you remove the air intake pipe and look inside where the crankcase breather is plumbed in you may find evidence of oil. If you do find oil replace the valve. If this is all OK then its possible that the valve stem seals are past their best and are drip-feeding oil into the intake. These can be replaced without removing the head by a competent garage in half a day or so an engine flush may also help if you've got a sticking oil scraper ring so its worth a go, as for the oil if you go up a grade / use slightly thicker oil then this is less readily drawn into gaps and less likely to be burnt off
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