Jack, if your using it offroad at all i would be under greasing every couple of weeks, at least and everytime you go offroad (preferably before) but it really depends how many miles you do, i was torturing mine at the weekend then doing five hundred miles a week, (mine was going through uj's like women go through knickers), and that was the only way i could keep on top of it, but the only way you can slowdown the hardning of the grease is by little and often, even still one side will harden at some point, now mine get more attention than my firstborn lol best of luck buddy