A: I can't recall the name of the lube off the top of my head, but it's not PAG (Ester probably?) Pour some into the compressor before installing (too bad the valves weren't shut off before. I always try to when working on a system) There is also a cleaning spray they use. As for the internal seals, etc, I don't know if the Sanden are doable at home, but I did one of the Yorks years ago (I turned it into an aircompressor for my worktruck) Moisture is the enemy to them. Even just what's in the air can corrode the internals of the compressor. From: Tom Jennings <tomj@xxxxxxx> To: AMC List <mail@xxxxxxxxxxxx> Subject: rebuilding Sanden compressors? Message-ID: <20050503002948.E676@localhost> Is it worth it to get these things rebuilt? I have one I believe is actually OK, but the ports have been open for over a year. No gross damage, it was kept dry, etc. Haven't spun it; it shows no obvious problems. With new ones around $300 it would be nice to rejuvenate this one.