Carlos from Spain:
What a cheap OPC! you'd think that their policy would be what ever the freaking manual says. I would also go back to 98, its not only about detonation diferences, there is also lubricants and other additives in petrol that are generally better in 98 than in 95, so specially during the breakim I would use 98.
The dealer is an idiot (and yes, please, quote me by printing this out and showing it to him).
A real disgrace for any Porsche dealer but he doesn't seem to be alone.
My BMW dealer for example fills up only 10 l on new cars...filling up the new car completely costs too much money. I know that dealers have to look at their numbers but seriously, does he need to care about 100 EUR on a 120000 EUR car? Doesn't make much sense to me.
Regarding V-Power (Shell, 100 octane): Most 98 octane fuels from Shell, Aral and Esso have 100 octane or even more anyway, sometimes it may be 99 but always over 98. There was a test in a german car magazine once. V-Power had 102 octane or so but on non-turbo charged cars, more than 98 octane doesn't make much sense.
On turbo charged cars however, things may look different, depending on the engine software mapping/programming. Some manufacturers allow a slightly higher boost pressure with higher octane figures, most don't.
On tuned turbo charged cars, using V-Power actually makes sense, if not for safety reasons only since the mapping is usually at the limit (or even over it) of what the engine can actually "handle".
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RC (Germany) - Rennteam Editor Porsche 997 Turbo, BMW X5 M, BMW M3 Cab DKG, Mini Cooper S JCW