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Discussion Starter #1
what oil are you guys running in the 6.4?
 

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5-40 in winter, 15-40 in summer.
 

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Haven't done my first oil change yet but I will go with the Amsoil DEO 5w40. I run the Euro. formula in my VWtdi. I'm at 121,000 miles and no problems, I had the cover off at 100,000 miles (timing belt change) and had no discernible wear or buildup. My experience prior to this with other engines with dino. oil was sludge and gunk built up in the top of the valve cover/s. VW required syn. and I'm glad they did, I'm sold on this type of oil. With the 6.4 making oil it may not be worth it, no extended changes, we will see? Mine is OK so far, knock wood.

Semper Fi:

737tdi
 
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