Bit of an engine related issue which is not my strong point.
My Z18XE is using oil, more oil than it should be.
It has been gradualy getting worse since I purchased the car, from using no oil to using about a litre every 1000miles to now using a litre every 300 to 400 miles.
After a long journey (bristol to cornwall and back approx 350miles) the exhaust tip is covered in black and there is also black up the boot on the side of the car where the exhaust is.
Under hard acceleration there is no visible smoke and after lifting off there is also no visible sign of smoke.
No signs of smoke on cold start up either.
So I can work out that some how the oil is getting used and ending up through the exhaust but for the life of me I have no idea what the problem could be?
Any help or suggestions or "tests" I can do to try and find the fault would be appreciated.