fd911

The other day when I was gassing up my 996 i opened the gas lid and it stated to use ONLY 95 Octane or higher. I gas up at only one gas station which has 93 octane and which is about 10 miles from my house but I usually gas up when im in the area.

Which Octane do you use for your 911?

DreamCarrera

93 octane IS the recommended octane for the 996. Your car does not state 95 octane, and if it does(probably 95 RON not 95 octane) that is some type of conversion difference as octane ratings are stated differently in Europe compared to the U.S.

You can use 91 octane in the U.S. and still be safe, although the cars ECU will retard the timing a bit to avoid knock and thus hinder performance a bit.

However, I would NOT run less than 91 octane in your 996. If you do, it will cause the engine to knock during larger throttle inputs and cause damage to the engine over the long run.

Pac996

Gas is a form of oil. Lets talk gas
I hate ethanol

100plus

ron 98

02TX996Cab

The sticker in your car is referencing RON (research octane number), which is how gasoline pumps in much of Europe are marked--or at least were when I lived in the UK for 4+ years. In the US, pumps are marked with the average of RON and MON (motor octane number, which is a different test method), or "(R+M)/2". RON is the higher number, and is about 10-11 points higher than MON. Doing the math, this means RON will exceed (R+M)/2 by about 5 points.

So...using gasoline in the US that is 90+ (R+M)/2 will meet Porsche's requirements. That means using premium in all circumstances--no regular or midgrade, unless those are the only things between you and running completely out of gas. I use premium without exception, purchased whenever possible from one of the major manufacturers (Chevron, Exxon, Shell) since their additive packages perform better and keep your injectors and valves cleaner.

Using the lower grades won't harm your engine, as the DME computer will detune the engine to prevent knock (it retards spark timing, as DreamCarrera states). You will be a bit down on power however.

I've spent quite a bit of time driving up in your neck of the woods, and IIRC Exxon sells 93, whereas most other retailers in Southern MO sell 91; so, Exxon gets my business when I'm up there. (For the record, I'm not an Exxon employee--quite the opposite, I work for one of their largest competitors!)

csubtil

RON 98 octane at $9.00 a gallon... Welcome to Portugal!

Sometimes I use RON 95 octane if 98 it's not available.

CS.

rpm's S2

93 from major retailers. Usually Shell.

I also try to find ethanol-free fuel, though I'm not obsessive about it.

http://pure-gas.org/

Dennis C

Shell 91 octane is the best I can get in the mountains.

Invius

Shell 93 if given the choice. If I find myself in dire straits, then the highest Octane from a national retailer will do.

Dstutler

I also use Shell 93 when possible - never ethanol.

Imo000

If 91 meets the requirements, anything over it is a waste of $$$$.

Gonzo911

Chevron 91. There is a station here that has 100 octane "racing fuel". Twice as much $$$ per gallon. I thought about trying a tank to see if there was that much of a difference. Has anyone else used it?

Ubermensch

No real advantage in going to 100 octane. Octane is just a measure of detonation resistance. So unless you have an engine tuned to take advantage of the higher detonation threshold (high compression, forced induction, etc) you won't see any power increase with higher octane.

babylonboots

Shell 93 here in Spring TX. Thanks for the comment on 100 octane. I was thinking of trying a tank.

ivangene

Chevron - top tier (91 or 93...I forget what we have)

techron additives will help keep your motor clean, its proven



and black cars are fastest - wait, make that RED - Red are fastest