5W-30 vs 10W-30 - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-08-2006, 10:02 AM   #21
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Cool, thanks guys for the help.
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Old 09-10-2006, 03:33 PM   #22
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Quote:
Originally Posted by MACDRIVE
I think you should be going the other direction, 10W-40. I've been using MaxLife 10W-40 since May 04, 2006. I was previously using Chevron Supreme 10W-30 or Castrol GTX 10W-30.

With the 10W-40, I'm getting a smoother engine with less buzz, way better gas milelage, and quicker accelleration. I suspect the reason for that is the MaxLife is actually a synthetic blend, although it is not marketed as such. I chose the Maxlife because it is on the thin side of a 10W-40.
Yes, you'll get 20 more hps and 5 more mpgs going to this oil... whatever! I smell b.*.
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