wondered if anyone can help. I've got a de-cat on, ive got an oil/fuming smell coming through the vents when the car is stood. Its not a petrol smell, cos i know that rich smell from having a de-cat, its not burning oil smell and it doesnt use any oil. Imagine if you took the oil cap off on the engine and you get that oily fumy smell it smells like that. it doesnt smoke, just wondering if it could be a blocked breather. Any ideas where to check. The oil has been changed about 100 miles ago so its not old oil