You should regularly check :
Steering box oil (under the nipple on the front glacis plate)
Engine oil (left of drivers position, check the level with engine running)
Gearbox oil (left of commanders position under flap)
Coolant (under the disk in the middle of the engine air leuvres)
Final drive oil (disk on front of the drive assemblies just behind the drive sprocket)
Track tension (you should have about a clenched fist distance between track and hull in the middle of the droop, if not theres a grease nipple on the back of the piston pushing the rear roller out)
Hub oil (jack up each wheel and rotate until the arrow on the hub is upwards, then remove the large nut on the upper right of the hub and the oil should be level with the hole)