someone told me and i read articles that diff weights and vicosoties will create and lose hp dependin on the set up ?
someone told me they use 20w50 race oil and gianed 3/10's? this was in a hot rod, but is this true? if so what weight are good to use ? i still use 5w30 in my car

 

This thread will have so many different opinions. For an overhead cam motor, a thinner oil should produce more power. 20w50 is too heavy for a Honda motor. Prostock NHRA guys run very thin weight. I believe it is 0w10. Go figure, they are the factory hotrods.

Oh, I use 5w30 Royal Purple. I suggest you stay at 5w30. May 10w30 but no higher.
Again, this is my opinion. Good luck.

 

i run 20-50 in the summer and 15-40 in the winter. Im sure i could gain some horse power by running thinner wieght oil, but i like running the thicker oil . Maybe im just hard headed, but thats the way im gonna keep it. And yea... everyone has there own opinion on this subject.

 

bump for more ideas.
many peoplw have told me 5w30 is too thin