Quote Originally Posted by vanich View Post
I want some clarification lang,since walang winter sa pinas or even lower than 15 degrees ang temperature so its safe to use sae40.The 15w is good for -20 degrees cranking.Why are we still need 15w-40 specially its expensive compare to monograde?

Like Doc recommends TOP1 SDO and Delo 400 are the best bang for the buck...Not simply because they are multi grades but due to they're TBN rating. Maybe if you can find a locally available monograde oil with good TBN rating too you could use that and maybe share it with us...