Parrots repeat what they heard, not necessarily what they know
The gearbox requires no protection against corrosion. Lubrication does not flush debris or wear bits in this case, or provide any form of cooling. That's normally what lube is for. Here it only does two things... 1) provide a means to COLLECT dirt and debris and 2) reduce chatter by 'filling' the voids. Most people will end up using lubricants that will harm the plastic more than help it. The clock gearing is so slow and infrequent it doesn't need it. In short... more people will screw it up than benefit.
Or you can listen to Clay... http://www.pinrepair.com/em/index1.htm#lube
"As a general rule, keep this in mind for EM moving parts: Metal to metal lube is OK. nylon to metal NO lube. Nylon to nylon NO lube. And NEVER EVER lubricate the moving metal plungers inside coils (even if the metal plunger is moving inside a metal coil sleeve). Also NEVER lubricate the gears of the score motor.
In regards to nylon, all reference I find from professional plastics companies speak of nylon as "no lubrication required." In fact they mention how nylon can be worn by various greases that collect dust and act as an abrasive paste. There is also a concern about nylon expanding when it it lubricated. This is just more evidence that you should not lubricate any nylon parts."
Yes, modern Synthetics will generally be safer to use with the plastic bits.. but there is no need to. You have more to lose than to gain. The clock gearing will run for DECADES dry.