Fuel?

PhoenixOp · Post by **PhoenixOp** » Tue Aug 25, 2015 1:22 am

Probably seems like a stupid question but, what fuel should I use in my '85 635CSi? If I read the owners manual correctly, I should use premium minus the ethanol. In the tech-article forum, there is some talk about installing a Dinan chip and then having to run premium. So if you don't have a chip, what fuel should I run. My 850 gets indignant if you even think about anything other than the best gas on the planet. I just hope it's cousin (e24) doesn't share the same thought.

Thanks to any and all,

Mike

Ralph in Socal · Post by **Ralph in Socal** » Tue Aug 25, 2015 1:39 am

I run regular on US model cars and midgrade on the euro high comp motor. Seems to work well without any signs of preignition.

Good luck keeping alcohol out!!

Ralph

PhoenixOp · Post by **PhoenixOp** » Tue Aug 25, 2015 2:05 am

Ralph, thanks for the help.

There is a Sinclair station here in town that advertises his premium does not have ethanol. I know for sure the regular does, not sure about the mid-grade.

What is the best secret sauce to add to fuel to mitigate the "Ethanol Effect"? All the propaganda about Sta-Bil and that ilk, just wondering what the guys who have way more experience with e24's and BMW's in general think.

Thanks again,
Mike

BillDe · Post by **BillDe** » Tue Aug 25, 2015 5:43 pm

PhoenixOp,
The 76 station on State St. down town Boise has all 3 grades non ethanol. The 66 stations, one on Overland Rd. by the Edwards Cinema, and one on Fairview in Meridian have only non ethanol, but only regular.

Mr_Squishy · Post by **Mr_Squishy** » Thu Aug 27, 2015 12:41 pm

After replacing two small engine carburetors last year, I started seeking out ethanol free gas. It's all I use in the E28 and E24 now. Gas mileage seemed to bump up a bit.

This web site is useful for finding the ethanol free gas stations:

http://pure-gas.org/

John

Da_Hose · Post by **Da_Hose** » Thu Aug 27, 2015 6:41 pm

Here in California, I am running Chevron Premium in everything, except the RV. It gets regular.

Nothing gives me any issues. The RV is carbureted and runs just fine.

Jose

GripGreg · Post by **GripGreg** » Thu Aug 27, 2015 9:24 pm

In Long Beach, I run Arco Premium, which is suppose to be 91 octane, so the pump says? In both cars.
Lately, it's been costco premium because of the price.
Still 91 octane I believe.
Every now & then I use STP Fuel Inj. Cleaner.
It seems to work.
Greg