There's gas station pretty close to my house that sells ethanol-free gas, but it is 89 or 90 octane, which isn't ideal for the M635. I usually put octane booster, but now reading about the orange deposits on the plugs etc. Not a fan of that, but not sure if it's a problem. (lots of folks with expensive cars seem to love Boostane and Torco).
What do y'all run?
(the search function is temporarily borked, so I couldn't search)
Unfortunately there are no nearby sources of ethanol free fuel here in MD. I've used octane booster in the past but not regularly or recently. I didnt really see and change.
I have used 100 octane fuel but it's expensive (about $6 or $7 a gallon the last time I got some) and the reasonably close sources of that have dried up. That fuel made a difference. The euro loved it!
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00 740iS
84 635 (euro)
88 M6
84 745i
88 325iX
92 850i (6 spd)
Because ethanol-free gas is HUGELY expensive here in Idaho, I use Shell 91 octane (highest I can find), with the addition of a product called Ethanol Defense by Bell Performance.
https://shop.bellperformance.com/pro...thanol-defense
If you look at the product to fuel ratio, it's 1oz for every 10 gallons, which makes it inexpensive compared to other products. It will increase your mileage and does make the car run better. It even has a top-end lubricant for my '67 Riviera which does not have hardened valve seats. I run it in all 16 of my cars and their diesel products in my dually.
No relationship to this product other than happy user.
Mike
Mike Drives:
BMW's
E24 - 635CSiA - (1) 1985 (US)
E24 - 635CSi - (1) 1985 (EC)
E31 - 850iA - (1) 1991 (Black)
E31 - 850iA - (1) 1991 (Calypso Red)
E32 - 740iA - (1) 1994
E32 - 750iA - (1) 1990 (Not an "L") (EC German National)
E32 - 735iL - (2) 1990
E32 - 750iL - (1) 1990
E38 - 740iLA - (2) (1) 1997 & (1) 1998
E38 - 750iLA - (1) 1998
E38 - 740iA - (1) 2000 "Short Sport"
E39 - 528iA - (2) - 2000 & (1) 1997
Also:
2015 Ram 3500 Dually, Cumins 6.7, Std.Cab. Long box 4x4 (To haul all this junk when necessary)
2014 Dodge Dart Rallye (Daily Driver)
2007 Mercedes Benz CL600 (Brabus SV12S)
Mercedes Benz SL's - (1) (2002) & (1) 1999 500 - (1) 1999 600
1967 Buick Riviera (2)
The loss of power was one thing, but having what is essentially corn whiskey sitting in my fuel lines etc isn't ideal...
My motor definitely appreciated higher octane
Last edited by e24mpwr; 05-12-2018 at 11:05 AM.
get near a large lake, most boat owners want non ethanol fuel, no they demand it
I have replaced fuel lines and run a 50/50 blend of e85 and aki93. Gives me an aki if 102 octane. Mixtures are perfect on this blend on the wide band
BMW’s
90 E34 M5
84 E24 M635csi standalone ecu with coil on plug
94 E34 540i/6 SC 5-17psi Flex fuel/standalone ecu
97 Z3 2.8
97 E36 M3 euro SC still u/c
OTHERS
11 Audi S5 APR stg2
19 Volkswagen Amarok V6
This site is incredibly useful: https://www.pure-gas.org
Good site...Thanks!
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