91 or 98 will it hurt it running on 91?

robotnik, Jul 1, 5:11pm
A direct injection car like that really needs to run 98 otherwise it will suffer from carbon build up on the valves which will mean rough running and an expensive bill to clean it.

m16d, Jul 1, 5:40pm
GDI's will ping their heads off with 91. don't use it.

intrade, Jul 1, 5:49pm
and dont use ethanol crap either from gull- then you better use 96 instead or 95 i think it is. if you cant use 98

thejazzpianoma, Mar 31, 1:00pm
It's also pretty unlikely that you would save any money running 91 in that engine, even aside from the expensive repair bills. Economy will generally suffer to the point of eating up more than the difference in fuel cost. So there is just no point to it at all.