I think synthetic flows a whole lot better so should be easier... but maybe I am the one missing something - cuz I have only had a problem with the front diff leaking so maybe the issue is in the back. I wish I could do a bunch of work to my VX before MOAB but I will be hard pressed to just get the front end rebuilt. I desperately need shocks, probably a tune up.. eh, I would just get depressed if I listed everything I need done.