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Discussion Starter #1
HAS ANY ONE TRIED amsoil in there duramax and what were the results and what about additives like polydyne TX7 ?
 

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I run the Amsoil syn 15W40 and there filter and like it so far. No problem starting in the cold (20's) and it seems to idle a bit smother as well. They say you can run it for 10000+ miles but I am going to change it at 7000.
 
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