Jerry911

attendant put in mid grage (89 oct) instead of hi test
some people.....

car seems to run OK, should I drain tank?
add a fuel additive or what?

Jerry

bornrich

You are okay as long as you don't push the car too hard in hot weather. You could use an octane booster but that will only raise the octane by .1 or .2 Not worth the money IMHO.

Just be a little carful and refuel with the good stuff next time. I have done this on purpose to test weather or not I really need the hi-test. No harm done just a little pinging on hard acceleration in high gear on the freeway. Of course YMMV.

Jerry911

thanks

will sleep a little better tonight

Steve Weiner-Rennsport Systems

Jeery:

If you can dump 4-5 gallons of unleaded race gas or 94 octane Suncoco in there, your engine will be FAR happier.

Nobody can hear the sub-audible detonation that breaks rings and ruins ring lands, due to the inherent amount of noise these engines make. Never depend on your ears to determine if things are OK or not in this regard.

upallnight

Now Jerry is going to lose some sleep until he refill his car again.

Jerry next time pump your own gas and you won't have problem with some pimply face kid putting the wrong grade gas in the Porsche.

Where do they still have attendant pumping gas?

HarryD

In Orygun, the attendant pumps yer gas (it's the law). I always get out of the car and stand by him as he selects the proper grade and inserts the nozzle.

bones

ooo.... I feel for you peeps we can get 98 octane here . It costs a small country mind you to fill up .

George H

98 Octane R+M/2 or 98 RON? 98 RON is 93 R+M/2, what we get here (at least if you're not in CA)

Jaws911

Lately, because of general NYC paranoia, I don't necessarily trust any local gas station (I imagine the turnpike guys are alwaays OK,tho) and I hate running low - - so I never fill the tank from empty - that way , I figure even if I get some bad or lower octane gas, it won't so bad for the engine.

just an idea to pass on

sschmerg

I've posted this before, but here it goes again:

98 octane in Europe is equal to 92-93 octane in the U.S.. Europe uses a different method of calculating the octane number. More specifically, Europe uses the Research Octane Number, or RON, while the U.S. uses RON+MON/2, an average of the Research Octane Number and the Motor Octane Number. The U.S. method yields a lower "pump octane" number, but the actual octane level is the same.

-Sean

Trust me

Geez, Think you are getting a little too worried. Dump some good ole' California 87 in there. Live with crap gas every day. No problems. Long term maybe (by that time, it will need to be re-build anyway). Just don't start off in third gear. Cut down on engine strain. And, try to get out of second before you hit 55 mph.
Just my 2 cents.

Troy

Ron_H

I have always used 87 octane in both my 914/6 and my 928 and it seems to love it. And it create less carbon too. And prior to that I used it in my 911E and it loved it too. And I also use 76 brand 'cause it has no MTBE.
When I've switched to higher octane my ***-o-meter couldn't tell any difference, so I went back to 87, and I loved it.

Doug&Julie

There was a recent article in USA Today in which even Porsche admitted that their cars will run on lower octane fuel with a barely perceptible difference. Newer, more sophisticated fuel injected motors have to be able to run on "low test" fuel due to inconsistencies of gasoline around the world. I would think the fuel injection system in the Carrera 3.2 is relatively sophisticated and would fit into this category. Will the Porsche run better on higher octane? Yes. Is it designed to run on higher octane? Yes. Will it harm your engine to run on lower octane? No.

Steve Weiner-Rennsport Systems

Hi Doug:

I think Porsche was referring to the 3.6 litre cars and later, that are equipped with adaptive engine management and knock sensing.

The 3.2 and earlier cars are FAR more prone to engine damaging detonation (no knock sensors) and should not use 87 octane fuel. You'll never hear the detonation that breaks rings.

Only the cars with CR under 8.5:1 can use 97 fuels.

Doug&Julie

That makes sense. Ok, never mind....