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It doesnt matter what ron fuel you put in your car it says in the fuel cap in my 182 98ron but it doesnt matter if i put in 95 or 97 it will proberly run better with 98ron there is more octane in it thats all
optimax will not damage your engine or change the performance of it in an RT but you would notice a difference in a car that is recommended to run on 98ron eg 172
you won't notice any difference yourself. but your engine will stay happy for longer. cleaner. only thing i've noticed is that it lasts longer on motorways.