Just a couple of tips. I'm sure others can add to or have their own methods.
1. Find a suitable material to store your tank on so it is off the suspension. Some people use blocks of wood. I use cut pieces of foam just thick enough to raise the hull so the tracks hang down. Relaxing the spring tension, especially when you get heavier tanks, means a lot for longevity.
2. We sometimes run our tanks in dirty/dusty environments. Do your best to clean all this debris off after every run. I usually start with blowing them of with air from my air compressor. Canned air is good too but cost escalates. Try your best to get leaves, grass and mud out of your tracks. Mud = bad.
3. A lot of us lubricate our gearboxes. Depending on the material of gears, different lube can be used. I only lube my gears once a year. Unless they got wet, for some odd reason. Ha haa. Like getting flipped upside down into the river.
For my metal gears I use 20W50 out of a dropper. Doesn't take much. Lubing also brings a new issue. It does tend to sling inside the tank if you've used too much. You will want to make some sort of splash shield.
Just a start. Cheers.
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[b]You may be a king or a little street sweeper, but sooner or later you dance with the reaper! - Death[/b]