G'day Mike, A lot depends on how much you use the vehicle I guess. I actually change my engine oil at 5000k intervals but gearbox/transfer go out to 20,000k. The oil in the gearbox/transfer doesn't get to see the extreme temperatures that the engine oil does so it will keep it's qualities much longer. Diffs I change out longer as well. Probably 50,000k.


 
						
					 
					
					
 
				
				
				
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