I have narrowed it down to either penrite's 0w40 premium or shell helix ultra 5w40
Penrite 0w-40
Shell Helix Ultra 5w-40
Between these two which is best ?
Thanks for all the info!! I will look into Shell helix ultra as I like that it still maintains the ll-01 standard. Would you recommend I add a ZDDP additive as I have removed the catalytic converter?
Hi, I am new to understanding oil in more depth but I am definitely keen to learn if anyone wants to teach me. I understand basic stuff like lower NOACK is important to reduce oil burn off and higher base number is good to balance PH. I have also looked Into the importance of viscosity index and...