UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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If the turbo was checked and tested properly and is found to be o.k. ( this is the most common cause for this issue) this may be a fault with engine oil rings on the pistons ( the compression will still be good but the oil rings can leak in some cases) or possibly a fault with the cylinder head gasket leaking.In most cases it is the turbo that leaks and causes this fault.I would have this double checked to see if this is the cause and if found to be o.k. I would have the head and head gasket checked and piston rings.Have the engine ventilation system checked as well to see if any components are plugged.
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Yes this is usually the cause but I wasnt sure if you were seeing any nasty looking spark plugs here so I put it out there as a possibility.
If you have a cylinder head gasket leak though ( which can occur and can be common ) then this can allow oil to flow past an oil port into the exhaust itself.This is one of the more common leaks that wont cause any running issues.I would have this checked into to see if this is the cause here.
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