Originally posted by cnavarro
It's all on the link to the oil article on my website. It appears that m1 15w50 hasn't changed much from what was sold over 10 years ago, in my testing. I also tested some oil school kendall gt-1 from the 70s, and the levels of Zn and P are pretty much the same as what they put in m1 0w40 and 15w50 (as well as m1 20w50 vtwin m/c).
Charles, I thought that Mobil is phasing out 15w50?
It seems that you can only get 0w40 / 5w50 now at the major stores?