Recent content by nickgrab

Ok so I have spent an hour or two trying to figure out what all this stuff means. I went to walmart today and was surprised to find that the only SL m1 oil I could find was 10w40 hi/mi. I almost bought 15w50 but it was SM rated. When I went to m1's website I found that 10w40 has 1000 ppm. 15w50...