986 Forum - for Porsche Boxster & Cayman Owners

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-   -   Opinions on Sunoco Gas (http://986forum.com/forums/boxster-general-discussions/2591-opinions-sunoco-gas.html)

99-Boxster-MK 04-27-2005 01:26 PM

Opinions on Sunoco Gas
Anybody have an opinion on using this gas in our cars. It has about 10% ethanol in it?

The Ultra 94 is the highest octane gas I can get here, with the next highest being 91 octane which is non-ethanol.

Which should I be using?


Adam 04-27-2005 03:10 PM

Porsche recammends 93 oct for optimum performance and gas mileage...but you can get away with 91 oct of course.

xavier405 04-27-2005 04:13 PM

Here in CA all we can get is 91 octane. I don't know why, I never looked for 93 until I got the Boxster a few months ago! I recall someone said on this board that CA has only 91.

Does anyone know 1)why? and 2)What is the safest method for upping the octane? I have read about adding "xylene" but I am sure there are many products out there.


Brucelee 04-27-2005 04:47 PM

I have never used 93 in any of my Porsches and am wondering how the car could run any better. However, I have noticed that Chevron with Techron is absolutely the best gas in CA. Some of you may know that our gas is totally crappy but for some reason, my cars run, start and idle better with Chevron.

I have to sound like an ad but it is actually true.


99-Boxster-MK 04-27-2005 05:01 PM

What about the issue of ethanol in the gas?


Bushwhacker 04-27-2005 06:11 PM

We have to run on a Winter blend here which is 10% ethanol. Most if not all vehicles are engineered to handle it. If I remember correctly, I believe I read that it actually helps raise the octane rating. When it first came out years ago, we had problems with older engines (including bikes, outboards, etc.) having plastic and neoprene parts soften and "melt". But those parts have been redesigned to cope with an alcohol mix. One plus - you don't need to add HEET.

BTW - my '05 manual recommends 98 RON!

BuffaloBoxster 04-28-2005 07:42 AM

I've used it in my 01 without problems.

tqtran 04-28-2005 10:12 AM

I run 93 in my 986 but one time I went up to Canada where only 91 was available, oh man! the car seemed to run like $hit to me. I don't know how you 91 octane guys can do it. My solution in Canada was to go to a auto store and get some Octane Boost, my car ran so much better once I uped the octane.

xavier405 04-28-2005 12:13 PM

tqtran - what product did you use? Sounds like a good testimonial!

Perfectlap 04-28-2005 12:15 PM

Politically its the right thing to do.

Sunoco, Texaco and Chevron are all domestically drilled and refined gasolines.

S_PILOT 10-24-2005 07:29 PM

I've been running Sunoco 94 in my Corvette Z06 for two years, and several RX-7's and Supra's prior to that. I have never had any motor or fuel filter issues ever.

I swear by it.......and now it also goes into my S....

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