When should the front wheel bearings on a 2013 Mazda BT-50 be replaced or repacked?

After 100,000 hard off-road kilometres, you'd be wise to check pretty much every system and component of your car, including the wheel bearings. Bush tracks and rough regional roads put all sorts of stresses and strains on mechanical bits like bearings, suspension, brakes, bushes and the whole driveline.

If you read most owner's manuals closely, you'll see that the recommended servicing schedule is based on normal or moderate use, not hard-core off-road work like you've been doing. With that in mind, the advice is to shrink the service intervals and the distances at which major parts like wheel bearing are checked and/or replaced. Give some thought to changing out the vehicle's fluids, too, including the front and rear differentials, as contamination from water crossings can destroy the lubricant and lead to extensive internal wear.