Oil question...SAE to Syn back to SAE?

Had my '08 4.0L since new and dropped the OEM oil before hitting 3k ( mainly to check for flaking or other possible "break-in" contaminants ) and replaced with SAE Valvoline at first change, then all other changes since, I've ran Mobil1 Synthetic in it........would it really matter to go back to SAE now that I'm at over 50k miles? My work now carries it in automotive grades and I can get it extremely cheap, but I don't want to risk any issues if there's conflict between using the two different lube types after this long.
I haven't really seen any evidence through my searching that tells me I would doing wrong by changing back to SAE as I've seen a lot of folks going from SAE to Syn, but not the opposite.......any advice?

 

just switching back to Valvoline conventional ( SAE ) oil from Mobil1 synthetic - if that's what you meant by "dyno top syn and vice versa"

 

You will have no issues.

 

^^^ What he said.Won't hurt a thing.

 

Your truck will blow up.