Dvldoc, just wanna clarify... fleetguard LF3564 is a dual by-pass flow filter compatible with the Mitsu 4m40 engine? right?

How about Castrol Magnatec 10w-40? its semi-syn but I'm not sure about its rating if its good for my 4m40 diesel, the label says its good for gasoline & diesel engines. Its currently on my rig though I'm thinking of putting in TOP1 SDO 15w-40 cause its slightly cheaper and like you said has more zync content.