J Joe G New member Jan 22, 2010 #2 The regular stuff works fine. The higher octanes are not necessary.
M Mad Jack New member Jan 22, 2010 #3 87 octane regular, unless it is the supercharged GS model. The supercharged model uses 92 octane.
J JetDoc New member Jan 22, 2010 #4 Your 98 Buick should do fine on 87 octane regular gasoline. DO NOT use diesel. That other guy is a moron.
Your 98 Buick should do fine on 87 octane regular gasoline. DO NOT use diesel. That other guy is a moron.
