I have a couple of questions though. I use Renewal Lubricants Food Grade EP grease for the piston and top of the connecting rod, as this grease comes in contact with the plastic piston guides and seal. I don't know the material used in either, and assuming they're not polyethlene or polypropylene, I'm guessing the grease is fine, but the fact that I don't know keeps me using a silicone based grease. Since it's plastic to metal contact, this seems a good choice.
I'm curious as to the choice of RnT for the piston in your case. Just trying to understand, not being critical. I don't know the makeup of additives in the RnT beyond it's lithium base.
I have had better luck, so far, in the gear box with RnT than GG, as the Green Grease seems to get pushed out, maybe not as badly as regular chassis grease but doesn't seem to stay in place as well as RnT. I ordered a sample of Chevron Open Gear Grease to try also.
I'd be interested in your thoughts, as I am a firm believer that this is the key to longevity of these compressors. Kept properly lubed with something that stays on the gears and used as intended, they will last a long time.