What maintenance is required for a thru axle? A thru axle is a hollow axle that gets clamped by each fork leg and through the hub. Like what a motorcycle has. Much stiffer and stronger design then the typical QR dropout.

My sons newer downhill mountain bike has a thru axle on his front wheel/fork. I've never had a bicycle with an axle like this.

Is there any different sort of maintenance I should be doing?

Edit ---------

They are on some Marzocchi 55s, probably around 2008/2009 model year:
Keep it lightly greased where it comes into contact with the hub bearing races and dropouts. This helps get it in and stops it seizing against the dropouts (the axle and dropouts are alu).