quote:I smell yet another choice of oil you could try out for your synthetic oil life study!
Originally posted by 3 Mad Ponchos: What're the consequences of using a 50-weight oil in a car rated for a 30-weight oil? Say, 15w50 instead of 5w30? Cheers, 3MP
quote:True. Engines can accept a wide range of oil weights. They have to because viscosity varies so much with temperature. Even 20-weight is as thick as 50-weight at about 68*C or 154*F. You can expect higher operating temperatures, lower power, and worse gas mileage with the 50-weight and more start-up wear at low temps. Nobody has done a good controlled comparison on this board to show that thicker oils protect better than thin. We do know, however, that thin oils can protect very well, so why not use a good quality 30-weight (or 20-weight) and call it a day?
Originally posted by 3 Mad Ponchos: So, what I'm getting out of this so far, is that there is no serious negative consequence to pouring 50 weight oil in an engine designed for 30 weight. You can use any ol' weight in your engine and it doesn't really matter. So why bother having different weights of oil? We should all be running a good quality 50 and call it a day. Cheers, 3MP