I'm thinking of running a 50wt oil this summer to see how it effects oil consumption and performance. I have to keep my car 2 more years and with 155k on it, I'd like to limit oil consumption. With all M1, Amsoil and RL 30wt oils, I was using 1qt every 3k on average. So for a 10k mile extended drain with a 4qt sump, thats 75% of the oil being burned off which IMO is just too high and will foul up the plugs. Now, I know both of these oils appear very close in specs., but does anyone know which is more friction modified? I think this is important especially bc its a 4cyl and I'd like to keep my mpg fairly resonable. And no, I don't think thicker oils are better then the thin. This car has a TSB on it and has oil consumption by design. I'm hoping I can fix this by going to a heavier weight.