the sticker on the inside of the petrol cap of a mk3 gti 8v say 91 ron minimum but it is recommended to run on 95 ron.....thus sticking optimax is gonna make a insignificant difference and the knock sensor is only gonna pick up 95 ron as a max reading coz it has not be made to recognise 98.
Mk2 8v takes 98 ron as its recommended to run on this coz the sticker says it.
So my advice for all you 8v mk3 owners is sell your car and buy a mk2 8v coz a mk3 8v ain't no sports car.......too slow, too over weight and handles like a caravan plus it looks like a sack of sh!t. Futhermore, why pay GTI premiums for something that aint even close to being a gti? Its like buying a Fiat Uno 950cc and sticking a sign saying "badass turbo" and then paying gti premiums for a sack of sh!t.....plus its boring to look at and the interior is bland....
Think i will go back to mk2 forum now!!!
LOL