Annually unless I get distracted by the fishing as is happening ATM 
I know you have just put it back into the bar with much cursing etc but if it was my XD9000 and it had water damage in the g-box Id be pulling it off again and stripping/ cleaning the motor as well. Despite their "name" lowmount warns have appalling factory sealing to the motor and with not too much corrosion the smoke will get out.
ps a good trick for mounting them up is to put a couple of studs into the mounting nuts, lift her up, throw on another nut on the outside then you can muck around with the proper bolts from the outside.
Steve
'95 130 dual cab fender (gone to a better universe)
'10 130 dual cab fender (getting to know it's neurons)
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