Originally Posted by MikeD
Hey guys, I plan on using Castrol 10w 40 next summer for the added protection. I don't believe in these lighter oils. I'm even thinking about 20w 50. What do you think?
Long ago the 10-40 oils had the characteristic of clogging rings because of something in their chemistry. I heard a car mechanic say the same thing within the last year. He would recommend 10-30.
I do know a local mechanic with a 200K LeSabre in which he uses 20-50. Myself I'd jump to the 20w-50. I've noticed my 130K miles LeSabre using some oil. So I may go to that after April and warmer weather next year.