Thread: 3rd motor swap in car

Originally Posted by FordMan77

I also run my 00 Grand Prix GT and 95 Bonneville SE on 87 and they seem to do just fine. Haven't lunched a motor yet due to knock. Stop listening to people that may give bad info, read the owners manual for EACH car you own and follow their recommendations for octane levels and you should be fine.

My 99 GTP manual says in BIG BOLD letters to use Premium Unleaded Fuel ONLY... For the supercharged applications. Just like it does on the fuel door, guess as a last warning before you start with the premature detonation of your engine

Your NA GT/SE can get by with 87 with no problems, top swap and run 87 and tell us how far you get.