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Old 04-27-2012, 03:49 PM
Sanjaygb Sanjaygb is offline
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Location: Cupertino
 
Join Date: Mar 2012
Posts: 31
Mein Auto: 2008 335i conv.
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.
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