I have heard that once you start using 100% syn oil that you can not go back to regular oil. I've read some (not all) the threads re: using syn. At my infant stage, I'm not getting into the discussion of which is better - syn vs. dino 
If I use 100% syn at the next oil change, then later decide to go back to regular dino, are there any issues with that? Has anyone done that?
thanks.

If I use 100% syn at the next oil change, then later decide to go back to regular dino, are there any issues with that? Has anyone done that?
thanks.