I put costco 91 all the time.  Runs fine.
							
						
					Costco Gas?
				
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Another point of view
Steve
'89 332i
'90 M3
'01 530is
'24 MC JCW
'13 ZL1 Camaro
'18 RAM 3500Comment
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Not to mention what it's going to do to your MAF and your timing chain tensioner...I think it's going to slowly deteriorate your pistons and rip through your timing belt.
don't use that shit. Shell X- Power all the way.
tnow, sometimes I just mess with people. It's more entertaining that way. george gravesComment
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It's not just costco gas you need to worry about, it's ALL California gas you need to worry about. The additives and formulas that y'all have over there are so severely fucked, it's insane.
Get your gas from Nevada. Or even better, Texas./sComment
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FWIW, my friend, a 30-year senior BMW dealer tech who now owns and operates a very successful BMW/Mini repair shop, strongly advises his customers NOT to buy gas from Costco here on Oahu (he's big on Chevron and also recommends Phillips76). When I was working for him, we had tons of failed fuel pumps from customers -- especially Mini owners -- who said they bought their gas at Costco and/or off-brand stations. It got to the point where we wouldn't warranty a fuel pump replacement job (and we were probably doing at least a couple a week in a shop with six lifts) without a go-ahead to completely drain and clean tanks, blow out lines and replace the filter. Don't know if Hawaii has crummy gas in general or at Costco and off-brands specifically, but in the year I was there we saw a lot of fuel pumps that seemed to go south prematurely.
Meanwhile, I always scratch my head when I see people spending ten to twenty minutes waiting in line (and burning gas at idle) at a Costco station to save maybe a pocket-full of loose change on a tank of gas ...Last edited by ainadude; 09-03-2015, 08:49 PM.ainadude
Indian Wells, CA
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1991 325i 2dr. 5sp, delphin, w/freshly re-skinned IS sport seats/15" Ronal cross-spokes
1976 Triumph Spitfire w/1.8-liter Miata engine/transmission, koa dash with TR6 oil/volt gauges, lowered suspension, 14" Minilite replicas and more
2004 Kawasaki ZZR600Comment
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Your friend really needs to go back to school and learn some chemistry. Google to see how many refineries are left in this world.Comment
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Rebellion Forge Custom Fabrication
1988 325is - TrackRat in progress
Instagram @rebellionforgeComment
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I dunno, it blew out my friends muffler bearings and he had to buy a new cat. The dog didn't mind, the gas that leaked all over his driveway gave him quite a buzz. I think the dog is in AA now.
Save the dogs, don't buy cheap gasSimon
Current Cars:
-1966 Lotus Elan
-1986 German Car
-2006 Volkswagen Jetta TDI

Make R3V Great Again -2020Comment
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It's a government cover up man, Bob barker got so sick of telling everyone to spay and neuter their animals he spiked the Costco gas. All are animals are going sterile BRAH! What will they start putting in our Chinese food now!sigpic
Rebellion Forge Custom Fabrication
1988 325is - TrackRat in progress
Instagram @rebellionforgeComment
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Today's fuels are not good enough for the high performance 12v SOHC engines of the 1980s. Technology peaked in 1991 and the e30 is the pinnacle of automotive engineering.
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