Change the oil and filter as per normal intervals for extreme conditions , re air filter and fuel filter change on condition , as it will depend for instance on fuel cleanliness which can be very variable in the bush . You should have a water contamination warning light , which is quite common happening . When power seems to be dropping off 1st check by changing fuel filter , so carry a couple !
Air filter depends on dust levels, eg if following road train etc ! . They will blow out a bit do from inside to outside of filter , if water eg damp then just fit new .
L/crs tend to need frequent hub services esp in extreme conditions see handbook . Check for oil contamination in axles and gearboxes if wading creeks . Belts carry spares fit when/if bust HTSH
ps carry plenty of water and let people know where you are and eta as it can get very quiet off the main highway .
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