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Synthetic and conventional oil use

4K views 11 replies 7 participants last post by  7.3idiguy 
#1 ·
I bought a 2006 6.0 and the guy I bought it from was putting rotella 5w40 synthetic in it. Can I switch back to rotella 15w40 conventional? Should I?
 
#7 ·
I run mystik 15-40 from tractor supply. $16 a gallon. Its synthetic. I like it better than rotella t6.
 
#8 ·
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