Running rich - HELP PLEASE!!!

[leggy]

Okay guys, I'm looking for help in diagnosing/fixing yet another problem with my Audi 80 2.0E 8C/B4 ABK. The problem being that no matter whether my journey is short or long, my car (engine) stinks and it also seems to be kicking out a lot of fumes/smoke; both being more noticeable when turning the engine off or reversing.

I've been using the same semi-synthetic brand of oil myself for years (albeit it's now 10-40W as opposed to 5-30W, I think, but either way, they're the recommended oil grades for my car), I check my oil level regularly so that it's between min/max on dip stick, I've had the oil and oil filter changed in the past year (unknown brand but fully synthetic oil used, oil filter type/brand unknown), and I generally stick with the same fuel supplier, so no change there.

For those familiar with my tales about 'The Unreliables', they've said that the smell/fumes is normal for old cars (and TBH, it wouldn't surprise me if they've done something to my car when they changed the oil/oil filter!). A fellow work colleague however agreed that the smell is quite strong (not normal) and having asked me if its using a lot of oil, which it's not, then suggested that the fuel mix isn't right and that I should take it to be re-tuned.

Either way, and with the MOT due in April, my concern is that it may not pass the emissions test, so getting it sorted is high on my list atm.

Suggestions please???