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Old 04-27-2012, 04:00 PM
snowboardjoe snowboardjoe is offline
Officially Welcomed to the 'Fest
Location: Seattle, WA
Join Date: Mar 2012
Posts: 212
Mein Auto: 2013 X3 28i
Originally Posted by Sanjaygb View Post
I've been using Costco 91 gas in my 335i since August and felt the engine getting progressively worse over time. Switched over to Chevron 91 a few days ago... and I'm convinced that it's much superior to Costco 91. The engine is quieter when idling, and the engine's much smoother on the freeway. The reason I switched is because the car would shake quite a bit at startup. Read on here that gas could be the problem. The shaking has gone now too.
My partner and I noticed the same thing. I went with two tanks of the Costco fule and we noticed the power response was different. Totally drivable and it still delivered acceleration, but just not as much pep. Switched to Shell and BP and pep was back. I won't go to Costco anymore for fuel.
Joe Morris
2014 328xi GT (prem, tech, cold, conv, Msport)
2013 X3 28i (prem, tech, cold1&2, conv, hud) - Died Mar 2017
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