I have several quarts of the "green" Castrol 0w-30 left over from a several years ago. Nobody's car in my family takes 30-weight anymore, so I'm pondering about using it in my Mazda, which requires 5w-20.
The few discussions I read about oil weights have led me to believe that it's ok to use thicker oil in an engine. I seem to remember reading that the Castrol 0w-30 was more like a 40-weight. So I'm hoping to solicit just a few opinions about this before I trow it in the Maz. Thanks.
The few discussions I read about oil weights have led me to believe that it's ok to use thicker oil in an engine. I seem to remember reading that the Castrol 0w-30 was more like a 40-weight. So I'm hoping to solicit just a few opinions about this before I trow it in the Maz. Thanks.