I wasn't going to but I need to know the answer to this. Why in gods name is anyone using a lead additive in these cars in 2012????? Even the cheapest lowest grade pump gas, in the US, is more than enough octane for these cars with stock compression. There's a reason gas is unleaded these days you know, because its not needed anymore.
Even the "euro" compression should never be enough to need anything more than 91 octane, us rating. According to wikipedia, the required rated octane in RON for the high compression 924 engine is 95 RON which translates according to the below table to only 90-91 us rated octane, readily available at almost any pump in the USA.
"EuroSuper" or "EuroPremium" or "Regular unleaded" in Europe, "SP95" in France 95 85–86 90–91
Again, I truly do not understand why anyone is using lead additive (read: poison) in their gas in 2012. Maybe if we were talking about an old 1950s era ford, but a 924???
Edit;
Even 98 RON looks to translate to 93 AKI, or us rated octane, which is available at any and every BP gas station. Sorry but lead additive just doesn't make sense. Its funny you guys are letting this slide when everyone jumped down that poor guys neck for wanting to use r-12 to refill his a/c, but lead additive is a-okay. Lmao.
Edit again;
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fuel that the 95(e10 octane and 98(e5 octane fuel does not include some thing that are good for the valves.? Is this right?
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No this is not right. I believe you've confused the need for ZDDP in the oil with needing some un-necessary fuel additive.
Dave basically answered this above. I should learn to read the thread.