Aliv6 said:Can only make the car run better imo...Fresh parts! But yeh, alot of it is probably in your head! I can't even tell the difference between 95 and 98 RON in the Z4.

Not if they bugger up the valve clearance checks (e.g. put the wrong shims in or forget to put one back).Aliv6 said:Can only make the car run better imo...Fresh parts! But yeh, alot of it is probably in your head! I can't even tell the difference between 95 and 98 RON in the Z4.