How are you guys doing? I got a question about Marvel Oil,I'm using MC 5w20 and MC filter on my 4.2,my oil is still fresh like less than 100 miles used,I don't known if MC has a good amount of detergent I heard about Marvel Oil can clean and keep your engine clean so I'm planing to drain 16oz of oil and add 16oz of Marvel,what you guy's think?

 

That oil already has all the additives it needs. You can do damage running additional additives.

 

Just the correct grade of oil in the crankcases of these trucks and nothing else.

 

Ok thanks guys I'll stick with my plain MC 5w20 Winter and Summer

 

Couple threads discussing MMO:

https://www.f150online.com/forums/20...?highlight=MMO

https://www.f150online.com/forums/v6...?highlight=MMO

https://www.f150online.com/forums/v8...el+mystery+oil

https://www.f150online.com/forums/li...el+mystery+oil

https://www.f150online.com/forums/v8...el+mystery+oil