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Chevy/GMC Duramax 07.5 -10 LMM Discussion of Chevy and GMC Trucks with LMM Duramax Turbo Diesel Engines

motor oil??

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  #1  
Old 02-21-2010, 10:03 AM
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Default motor oil??
What oil are you guys useing in your lmm? weights and brands?
 
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  #2  
Old 02-21-2010, 12:06 PM
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https://www.dieselbombers.com/altern...l-running.html check this out and see if it helps answer your questions
 
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Old 02-21-2010, 01:28 PM
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If no mods, most important thing is to make sure it is CJ-4 rated.
 
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Old 02-22-2010, 08:22 PM
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Rotell T 15w40
 
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Old 03-17-2010, 06:14 PM
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Amsoil 5-40 in the winter and 15-40 in the summer with their oil filter.
 
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Old 03-17-2010, 06:27 PM
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cj4 amsoil 5-40
 
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Old 03-17-2010, 09:51 PM
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Originally Posted by FastCR
cj4 amsoil 5-40
x2
 
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Old 03-17-2010, 10:49 PM
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they're all the same if they have the API and SAE stamps on them

SAE 15W-40 and make sure its CJ-4 rated is what the manual recommends.

Rotella, Amsoil, Super-tech oil all meet those requirements
 
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Old 04-19-2010, 04:00 AM
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i run the royal purple 15-40 and their filter havent had a problem with it yet been running it since i got my truck and i put it through hell everyday.
 
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Old 08-20-2010, 06:57 PM
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I would strongly urge you to use Amsoil. I am not selling you on the idea, but from experience it really works.
 
Last edited by TCU Fan; 08-20-2010 at 07:30 PM.
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