Originally Posted by sierra (Post 926671)

Just detonation!!! Detonation is what melts pistons.:(

If you can hear it then it's outside the range of the knock sensors because they will detect it and adjust before you can hear it.

I'm surprised that 95RON made it pre-ignite because the book does say it can be used if 85 is unavailable but 98+ is what it's tuned for. 98 RON only on the filler cap, so I don't know how they can sell it in US states with only 91AKI available?

Be careful using octane booster. I think it can damage the catalytic converters?

Originally Posted by JimLill (Post 926734)

http://www.racegas.com/fuelfinder might help

detonation can also hammer rod bearings

Originally Posted by BunnyRZed (Post 914136)

In modern cars we have octane & knock sensors that can retard the timing in order to compensate for lower octane fuels. You'll lose a little performance but nothing to worry about. Just pump the correct octane next time you pump gas.

Originally Posted by Ryeong86 (Post 926780)

You know most dealers do not fill up the tank with premium. For normal driving, I use 87 octane and haven't heard any pinging or any problems with my car. On auto x days or when gas prices are down, I do use 92 octane from Wawa. I never let my tank go lower than 1/4 and I usually switch on and off on 92 octane to 87.

Originally Posted by Ryeong86 (Post 926780)

You know most dealers do not fill up the tank with premium. For normal driving, I use 87 octane and haven't heard any pinging or any problems with my car. On auto x days or when gas prices are down, I do use 92 octane from Wawa. I never let my tank go lower than 1/4 and I usually switch on and off on 92 octane to 87.

Originally Posted by sierra (Post 926818)

Remind me not to buy a used car from you!:thumbdown:

Originally Posted by CSI:86 (Post 927005)

Woah! I always use 98RON/93AKI no matter what! It gives better mileage and better performance. I always fill up at 1/4 tank to 3/4 tank or full tank. But please always fill up with premium, never settle for anything worse :)

Originally Posted by Ryeong86 (Post 926780)

You know most dealers do not fill up the tank with premium. For normal driving, I use 87 octane and haven't heard any pinging or any problems with my car. On auto x days or when gas prices are down, I do use 92 octane from Wawa. I never let my tank go lower than 1/4 and I usually switch on and off on 92 octane to 87.

Originally Posted by Richard Cranium (Post 919182)

So what say you to the people in the Midwest that only have access to 91? 93 pumps are *extremely* rare in Nebraska and Iowa and most of the ones that are 93 are E10.

Originally Posted by Ryeong86 (Post 926780)

You know most dealers do not fill up the tank with premium. For normal driving, I use 87 octane and haven't heard any pinging or any problems with my car. On auto x days or when gas prices are down, I do use 92 octane from Wawa. I never let my tank go lower than 1/4 and I usually switch on and off on 92 octane to 87.

Originally Posted by FRiSson (Post 928718)

On a car that is designed to run on premium, and that specifies its exclusive use, using low-octane is foolish. You are forcing the engine to de-tune itself and run less efficiently. In addition, not all "pinging", as opposed to "detonation" is audible, so you are likely causing damage to your engine before it can respond to the problem.

Originally Posted by sierra (Post 914205)

93+ is the recommended octane rating in the US.
91 can be used when it's not available, without detriment but it's going to lose power and can't be good long term because it's designed to run on 93 octane or higher.

87 would void the warranty and almost certainly cause engine damage.