I have 5 5406 Compair/Mako's. Depending on the number of hours on your unit, it should give you years of outstanding service with little other than routine preventative maintenance. I change the oil in mine every 250 hours, using Chemlube 751/800, depending on service. The oil is not cheap. What I like about the Mako over the Bauer is the non-floating 4th stage piston. I replace my 4th stage piston and liners every 1000 hours, versus a bauer every 400 hours. I replace the piston and liner because I choose to, not because we have problems.
You didn't state wether your Mako was for home use or in a shop. If you use it at home, you should probably change the purification filters at least once per year, same with the oil. If you're pumping more air than that, follow manufacturers recommendations.
If you have specific questions, I have all of the service manuals for that compressor, and can help you with sourcing parts. Compair parts are higher than a kite, but I've managed to source valves, pistons and rings, bearings, oil, filters, etc. etc. from the same vendors that Compair uses. PM me and we can chat.
Frank