About a year and a half ago there was a thread about which gasoline to
use.  If I remember right, there was a general consensus that Vanagons were
made to use cheap gas, so I immediately switched from 91 octane Costco gas
<http://blog.modbargains.com/what-is-top-tier-gas-and-why-it-matters-its-at-costco/>
to 87.

A few weeks ago, after a tuneup and compression
​ adjustment​
in all 4 cylinders, my mechanic, Bela, told me I was using "BAD GAS."  He
told me that Costco gas was BAD, and would ruin the cylinders, and that I
needed to use 91 (89 at the lowest) octane *MOBIL* gas for the best
performance.  (Mobil gas is extremely high-priced, and averages $.3
​5
 - $1.00 per gallon above all other brands.)  OK.  So I switched to Mobil
91 octane - for my van ONLY, and I actually have been getting better
mileage.  (Had to use Gas Buddy to find the lowest priced Mobil, which is
​
on my daily route, and pay cash to avoid credit card surcharge
​.)​

Yesterday, I noticed the dog-eared stickers on my passenger door, and was
able to see that 91 octane was recommended when the vehicle was made
<http://s74.photobucket.com/user/edtech2000/media/Westy%20Sticker%2091%20Octane.jpg.html>!
  Another online source
<https://www.bimmerfest.com/forums/showthread.php?p=5572227> suggests that
cheap gas is OK if you supplement with a fuel cleaner every few tanks.

Does anyone agree that cheap gas is OK if used with fuel cleaners?  What
about Mobil vs other brands?

Patti
9 Westy Automatic
Los Angeles

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