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Having returned from a 280 mile round trip on A & B roads not motorways I noticed that the left exhaust tail pipe is slightly black with exhaust deposits as opposed to the right hand side that is grey. Grey being what I consider to be a normal colour. Both tail pipes were cleaned prior to the start of the day and therefore started from the same point. On checking with my local OPC if my engine required a retune I was told this is normal. i.e.The left cylinders always run slightly rich when compared to the right. Can anyone confirm this point and if so explain why this should be the case.
My car is a 996 C2, 3600cc with 35k on the clock. Registered in June 2002.
Many thanks