I know the manual reccomends 5W40 for serve weather conditions... however, I have a few boxes of 5W50 lying around.. which I don't know if I could use them for an engine with 9000 rpm.

any help will be appreciated. Thanks

 

fred i asked this already in our toronto forum I believe as well as in this forum...you would think you knew how to search buddy lol

anyways try a search...xviper posted the reasons for the oil weights

 

dude... don't know if i missed it or not.. but i couldn't find anything related to 5w50
could you post a link instead of just telling me to search?

 

PM Quik Lude for one answer , then PM Xviper for another opposite answer

I stick w/ 10 w 30 all year round..

 

I would not use a 5w50. At high temps, it will be too thick to get into the tighter tolerance areas of the engine, and that wide a spread of viscosity likely involves VI improvers which may or may not be stable. Who is the mfr of that product?

 

castrol syn