Hey ya'll, I just gave the John deere filter and synthetic oil a try, this is in my 92 fj80 with a mid mileage cummins. After a few thousand kilometers I checked the oil, this is got to be the cleanest ive seen in a diesel midway through the oils useage. Even compared to a 100,000km 3B with Amsoil dual remote and synthetic oil. I dont know if the filters and oil are doing there Job and getting all the contaminants out, but I thought I would make mention of it. ;p