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Can I go from rotella 5w-40 back to rotella 15-40? I was told that once you run synthetic oil, you cant go back. Sounds like a crock but just wanna make sure. I just find that my engine makes more noise with the 5w-40 syn than the 15w-40. Thanks

P.S. Not trying to make this into an oil debate !!!!!!!!!! Just wanna know if i can swap back without any harmful effects.
 

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you can swap back and forth with no issues. i hate how many old "stories" there is to synthetic oil.
mike
 

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it makes more noise because the oil is thinner but in my opinion the truck runs better with the syn blend motor craft 15-40 oil anyways. i think my truck works and runs better under a little bit of work as do all diesels. just my opinion. i was using 5-40 rotella syn too and i went back to the motor craft.
 
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