[alexwalton]

I too had a fuel/oil smell in the car, which was worse on acceleration. I couldn't tell if it was fuel or oil, but it smelled as though the car was running with too rich a mixture.

In the end it was the dipstick which hadn't been replaced properly after checking the oil level - it hadn't been locked into place.

Felt a bit silly (even though I hadn't checked the oil, my dad had), but it was a very cheap fix!