I hav some more questions concering the p70 and 80 engines

What kind of maintenance is need on these engines?
How long do the bearing last?
Can i do most of all the maintenance work myself or will i need to send the engine back to you guys?
How long will the engines generally last?
Is the cost of maintaining the engines low?
Can i start the air start engine with my 110psi air compressor?
Will the engine run on red farm grade diesel fuel?
how much will the average cost is maintenance and repairs cost me?

Thanks
Grant