http://www.mobiloil.com/USA-English/MotorOil/Files/Mobil_1_Product_Guide.pdf Note that the 15W-50 specifically says "for flat tappet/performance engines" and has 1200 ppm phosphorus (zddp I suppose). That's for regular Mobil1 as well as "Extended Performance" and the regular stuff is a lot less money. Note also it says that the turbo diesel oil will have P reduced soon. But it looks like they recognize a niche oil for us flat tappet nuts. _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list