Originally posted by airman1:
All of the European modern gasoline fueled engines are designed for 95 octane gas. However they can use any higer octane gas (as Shell Optimax in UK) without problems. If you want to go lower (91 octane) there is a plugg in the engine compartment that one must, well unplugg and use the lower octane gas only for a short while.


But they ONLY use the higher RON rating. Here is the US we use an average rating of both MON & RON.

Their 95 is like our 90-91 octane fuel.
Their "rare premium" 100 would be like our ~94 octane.

Also not ALL their cars are programmed for 95 RON. They have lower grade available and the majority of the cars are programmed for it (Just like the US - Economy engines prevail)


Also the "octane plug" is a thing of the past (or at least for any company smart enough to just use PCM code anyway)
It's all controlled by code in the PCM now.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.