Oil Viscosity
 

I was reading an article from "Fast Fords"Magazine.where they pitted a C6 Z51 Vette To A Roush.
It stated the Roush used 5W 50 oil.My Stage 3 Roush blower was added at the Dealer and I was told to stick with 5w 20 oil.Anyone with a factory Stage3 Roush,please tell me what oil they are using...Please

RE: Oil Viscosity
 

According to the latest newsletter from the Roush Owners & Enthusiasts Association (www.goroush.com), the factory fill in new Stage 3s is Penzoil Platinum synthetic--but the viscosity is not mentioned. Do a little hunting on the web, or call/email Roush or one of the contacts listed on the club site. In the meantime, don't worry about it too much. ;)

RE: Oil Viscosity
 

I would try to call Roush technical support and see what they say.

RE: Oil Viscosity
 

There is a reason why Ford recommends the thinner oil for the 4.6 3v. I'd stick with a 20 or 30. (I use full synthetic 5w20 and change it about every 3300 miles)

RE: Oil Viscosity
 

I read that Ford does like the thinner oil for there motors but I don't remember why?

RE: Oil Viscosity
 

I believe they cited really tight tolerances on the 4.6 3v. Everybody should keep in mind that whether you slap on a RoushCharger or Series VI, you've still got the stock Ford rotating assembly and the stock Ford cams.