As you can see from the list TDT and 15w50 have the highest ZDDP levels in the M1 line up. Then come the 5w50 then the HM/EP oils then the rest of them (not including race or motorcycle oils).
Originally Posted By: lipadj46
As you can see from the list TDT and 15w50 have the highest ZDDP levels in the M1 line up. Then come the 5w50 then the HM/EP oils then the rest of them (not including race or motorcycle oils).
M1 0w40 is right up there close to TDT and 15w50 also. I may give it a shot as an alternative to RT6 in either the Jeeps or one of the 440s.
Originally Posted By: JLR
Mobil 1 high mileage oil has a API rating of SL/CF. Does this mean that it has 1200 ppm ZDDP in it? I think the SM rated oils have no ZDDP in them.
M1 15W50 is SM/SF/CL/ rated and it has over 1200ppm of zddp.
Originally Posted By: JLR
Mobil 1 high mileage oil has a API rating of SL/CF. Does this mean that it has 1200 ppm ZDDP in it? I think the SM rated oils have no ZDDP in them.
Originally Posted By: ted s
>>>>>>>>>>>>>>?????????
Not talking race oils or motorcycle oils obviously but the 2 M1 oils with the highest ZDDP ppm are 5w40 TDT and 15w50 and those are both SM. The GF4 (or is it GF5?) rating is what limits the zddp not SM.
