Originally Posted by chancludo

Yes, but notice how the chinese page linking to additives
says



(emphasis by me) whereas the US (or German) equivalent doesn't mention it:
Presumably, Porsche didn't simply forget the "very important" note to use additives in these geographies

Originally Posted by pyramid

But it also seems very odd where porsche is very confident offering "warranty extension" up to 10 years (including engine) where they note the "important" use of fuel additives on that region, which they don't offered on US or German equivalent page that has no fuel additive note.

Originally Posted by chancludo

But notice they don't mention a price I'd love to sell a Chinese gazillionaire a $200k car plus extended warranty if it has a decent margin and helps the gazillionaire's peace of mind

I have no idea how the Chinese nouveau-riche think, but I'm sure Porsche has!

Originally Posted by radarryan

The 991 is my first 911, and I am in need of some advice from long time enthusiasts. Are there any fuel or engine additives that everyone recommends to clean out the fuel system and make the engine run at peak performance. For example, they say (granted, more so on domestic sports cars over imports) that a good octane booster will help the fuel injection system run at peak performance, such as a tank every 1,000 miles or so with an average American octane of 96-98, not European RON of 98 (American 91 or 93.)

I am not only interested in the over-the-counter additives such as STP or Lucas Oil but also more racing orientated additives. Basically, I just want my 911 to run at peak performance with the best possible stuff that everyone recommends and I can get.

Thanks for everyone's input!