In Reply to: leaded/unleaded gas posted by Rey on January 16, 2000 at 21:22:30:
As fas as I know the engines are the same exept for the cat. Running High oct. unleaded fuel should be fine. The only reason for running unleaded fuel in the cars with cats is that the leaded fuel will foul the cat.
: I run a euro non cat m3 in my country. have been running the car on 98 oct leaded. new legislations are phasing out leaded gas - the last batch will be sold by the end of the year. Is there a substantial diff in engine design between the cat/non cat version of the e30 m3. am looking at switching to high oct unleaded and I will only use additives/ lead substitutes if I have to .... does anybody know if I can switch to unleaded gas without killing my valves?