strokedviking
New member
- Joined
- Aug 31, 2006
- Messages
- 114
was just curious if anyone has tried or runs royal purple in there 6.0's? i am thinking about trying it out. replace engine, tranny, transfer, and diff oil with the purple. any draw backs? anything to look out for? i know that ford says that should only use there trans fluid, how relivant is that? is the royal purple going to work in the auto tranny?