3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

whats the best 15w-40 synthetic oil

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Old Nov 2, 2008 | 12:53 AM
  #1  
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whats the best 15w-40 synthetic oil

Im sure we have talked about oil befor ,but what is the best 15w-40 synthetic.I dont live in a cold climite so I dont need a 5w-40.
Richard
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Old Nov 2, 2008 | 04:56 AM
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From: Wesley Chapel FL
I use the amsoil synthetic 15/40 heavy duty diesel and marine oil.
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Old Nov 2, 2008 | 06:30 AM
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From: North Carolina
Originally Posted by 98whitelightnin
I use the amsoil synthetic 15/40 heavy duty diesel and marine oil.
X2, same oil.
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Old Nov 2, 2008 | 07:56 AM
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From: Southern Utah
I'm also a big fan of Amsoil 15W-40. But, asking what the best oil is is like asking what the best NFL team is. Your usually going to get a lot of opinions!
If you go with Amsoil, Mobil, Royal Purple, Redline, etc.. you'll have no oil-related problems.
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Old Nov 2, 2008 | 08:19 AM
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From: wilson,ny
amsoil here too- with a single bypass set up. i get 20,000 miles between oil changes.
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