I don't know that much about oil..(although I know a whole lot more than I did a couple of days ago thanks to this site.) Anyway, after reading several threads on this site, I am thinking that I want to switch to synthetic oil in my Montana 4940. My manual calls for 20w40 oil, but my dealer uses Rotella 15w40. I intend to use Royal Purple, or the new Rotella 5w40 synthetic.
I have 2 questions;
1. Do I need to use some sort of blended synthetic oil before I switch to totally synthetic?
2. Will the Rotella 5w-40 synthetic be ok to use despite the large difference in rating compared to the 20w-40 my manual calls for?
Thanks,
Gavin
I have 2 questions;
1. Do I need to use some sort of blended synthetic oil before I switch to totally synthetic?
2. Will the Rotella 5w-40 synthetic be ok to use despite the large difference in rating compared to the 20w-40 my manual calls for?
Thanks,
Gavin