Porto911

Hello,

just being a new owner of a 911 997.1 C, I’m trying to do my Part on educating myself and doing what’s best for the 911 long term.

so I’ve decided to fuel only at Shell with a 91 octane premium fuel. Should I be finding 93/94 octane instead? Im curious more about us in Canada. Reading up some old treads , I’m under the understanding that our 91 octane it’s a better and cleaner 91 then what’s offered in the USA. Reason for the American Porsche owners preferring 93 on there cars.

wondering with most you guys on where your fuelling and at what octane?

thanks

rileyracing1

I have the same car ...Stick with Shell V-Power NiTRO+ premium fuel and you are good to go and at the same time you are eliminating ethanol based fuels which our model year cars especially do not prefer. In a bind where Shell is unavailable use premium Canadian Tire or Costco as both to the best of my knowledge still currently do not contain Ethanol..

Imo000

How is it possible that cars this new are still not built for ethanol blended gasoline? Is this a fact or some internet myth?

Muskoka

It seems strange, but in my 03 Turbo, if I put Petro 94 or Esso 93, I'll get a CEL in 100km. Fill it up with Shell 91? It goes away. Every time.

993GT

run whatever is sold in high volume, 91 oct is totally fine from any name brand... modern cars have no issue with E15 or less, almost all of the gas brands are E0 on premium grade anyhow

Imo000

What is the trouble code that you get?

BIG smoke

Muskoka - On my 944T I had emission test issues. A change of the Bosch O2 sensor, cleared up the fail.
2oo3 Turbo - something is being read wrong, I would bet.
https://germanparts.ca/parts/porsche...xhaust/sensors at $255 each x 2.
On second thought, run the shell.

Porto911 - My 997.1 ran fine with the best fuel I could find.
Always put Prem in. I didn't notice any difference between 91-93-94.
I did notice a difference with new plugs and coils @96k service.
Coils were split and cracked, on my 4 season DD.

strathconaman

Porsche thinks you are wrong.

gbuff

Bah, what does Porsche know?

FWIW (not much in this case but just a point of info) every time I'm on track at Mosport I fill my 2013 MINI with Ultra 94 (n/a in the States) and it runs as well as it possibly can (with 121hp); no hiccups, no CELs, no nothing.

Gary

Imo000

How does it run with gas from the here?

gbuff

Here I use Sunoco 93 and it runs great, so I'm loathe to change.....though one time I filled up with Sunoco 93 at Mid-Ohio's track pump and promptly got a CEL; it cleared itself later on. I deduced that since was early in the year it was prolly old fuel sitting around in their tank all winter.

Imo000

Prolly?

928gt

Despite being a Petro-Canada, the pump at Mosport dispenses 94.9 octane Ethanol-free gas so it is not the usual Ultra94 that you can get at other Petro-Can stations (plus it is aboout as high turnover volume as they come). No idea what depot they get it from, but it is unique. I fill up the street car(s) there as well whenever I can.

On the '89 928, I use Shell 91 exclusively due to the lack of Ethanol. Ethanol is corrosive and I went through 3 aux fuel pumps (the pump is submerged in the tank and uses the gas as a lubricant) in as many years when it was getting either Esso 93 or Petro-Can 94. Switched to Shell 91 and no more problems in the last five years. On the newer cars I also use Shell 91 whenever I can, although they don't appear to be as sensitive to E10 as the 928 is.

Aside from fuel economy issues, Ethanol is hygroscopic and absorbs water, and the resulting corrosion and damage to the fuel delivery system is not insignificant in any car, modern or not. With E10 you can get phase separation simply because on a humid day the ambient temperature drops by 30 degrees (park outside in the sun and then indoors in the summer - or the opposite in winter), and all the water and alcohol collect at the bottom of the tank (which on Mercedes cars ends up rusting out the fuel filter from the inside). To make matters worse, seeing as the Ethanol is used as the octane booster mixed with what is now crappier gasoline, the remaining gas has now lost 3-4 octane points and a bunch of additives that more readily dissolve in the Ethanol, resulting in an engine CEL.

bcrdukes

Does Esso's 93 octane contain any ethanol?

928gt

Yes. Shell 91 is the only widely-available gas in Ontario that contains no Ethanol.