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Matt, Mechanical Engineer
Category: Audi
Satisfied Customers: 22907
Experience:  BEng hons Mech engineering, in auto industry 22 years
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My son has a 2009 1.8 Turbo A4 which has done some 40,000 miles.

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My son has a 2009 1.8 Turbo A4 which has done some 40,000 miles. The car uses oil at an incredible rate approx one litre every 500 miles. The garage said it was the turbo which they replaced plus a valve. The problem still exists. Any thoughts ?

1st thing to ask is what oil is being used as it should be on a 5W30 and there's the option of going to a 10W40 as well

I'd also check the crankcase pressure relief valve (PCV) ( unless this is the valve that was replaced) 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 carrys 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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