My little clubsport has been an alcoholic this last year. It goes through a litre of oil every 300 miles or so. To remedy this, so far I've done :

• Oil filter bracket gasket
• CCV valve and all hoses.
• Rocker cover gasket.

I'm waiting to see the outcome of the rocker cover gasket as I've just finished this. All 3 areas were contributing.

If it continues after this, is there anything else that could be contributing? Sump isn't leaking, and the only other culprit I can think of is doing compression tests on the cylinders to make sure they're up to scratch - mileage is 120k, so on the M54 I'd be surprised if they were on the way out.

I also did a smoke test with a Snap-on smoke machine, the air intake boots were perished so I replaced them too.