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Add a quart of Lucus oil treatment at oil change S t p will put a glaze on rod and crank bearings
I have been using AMSOIL diesel in my 2005 duramax since new. I use the Amsoil by-pass oil filter system. I change the oil every 2 years with oil analysis every 25,000. Never had a bad report. I probably will never use anything else. If you are using an oil additive you are using the wrong oil.
 
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