Hi all, I'm seriously thinking of switching from Z-alt 20/50 to Brad Penn with zinc.What weight oil would you use,or what do you use? I'm thinking 10/30 would be fine.My 340 is fairly stock.I just heard this oil is very good and using a lighter oil will give more HP and Torque.
My oil pressure now when cold is almost 80psi,warm it drops to 65-70,hot sitting at a light about 28-30. Let me know what you think.Thanks in advance!
