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Old Jan 5, 2006 | 09:50 PM
  #8  
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oilman
Advanced PassionFord User
 
Joined: Aug 2004
Posts: 1,553
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From: southwest
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SOme engine will respond differently to different grades depending on wear, mods use etc.

Start with a 5w-40 in a stock car and go from there.

Cheers

Guy.
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