Remember the additives are consumed overtime. If you change your
oil every 1000 miles than I doubt you would ever have a problem on any roller engine. I like the 15w50 but the mobil high mileage 10w40 also has a little more
zinc/phosphours just not as much as the 15w50. Once again for $12.00 you can buy red line break in additive and it will last 4 9 quart
oil changes and you can get the
zinc and phosphourus to 1400 ppm, anything above that is corrosive.