According to the owner's manual, there is no change interval, just a level inspection. Since we all know that can't be right, every 30K miles is reasonable and not asking much (once every 2-4 years typically) given only 4-5 quarts can be removed each time. Cars getting lots of highway time can probably go every 40K miles IMO. 8.5L capacity for the KL and 7.8L for the KJ.
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