Supposedly they fell apart and clogged piston cooling nozzles on the first gens, Blowing motors. Fram worked with cummins on the design after that and they are probably fine now, But the damage to the name has already been done so everyones probably going to say not to use them. I personally dont use them, I got 6 Havoline filters when I bought my truck and havent finished them up yet so Im using them until there gone. Ill probably get a more quality one like the stratopore fleetguard when I run out.