I thought mine was oil too but it washes off very easily, oil is usually much more tougher to remove?? But it definitely increased with oil consumption... its not from the road as mine was always contained to the side the exhaust was on! Shame I didn't get a picture of mine when it was really covered in it... dealership shrugged it off first time I mentioned it but it has been recorded on paperwork from them when I got the new engine along with description of 'problem car' lol.
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