Normally,the combination of a hardened steel ground worm running with a brass or preferably bronze wheel, given the sliding action of the gear contact, doesn't require the help of of a low friction additive such as Molyslip as the brass/bronze is to some extent self lubricating -.
Molybdenum Disulphide basically aids high pressure ,low speed gear contact as in a spur gear set where oil lubrication can be difficult unless pump fed.
Any automotive mechanism I've ever opened including things like window lift motors ,boot locking motors & windscreen motors have always had a simple yellow medium thick grease in them but am happy to be proved wrong.
I don't think you would go far wrong if a grease containing MoS2 were used but technically it is not necessary-one small advantage it has is the contact areas get a coating which aids starting in cold ,high load conditions.
Any grease in the right quantity is better than none as long as it coats the gear contact area.
By contrast,I have recently replaced the electric motor in my 18v Bosch Lithium Ion hedgetrimmer-the driving gear set is a high spur gear reduction driving an eccentric cam which gives the blade reciprocating motion.This hedgetrimmer goes into "sawing" phase if you cut a large item say 12mm dia & then reverts to trimming once cut.
I repacked the the whole drive area with a Moly type grease which is what appeared to be used when manufactured.The thing can run for over 30 mins or so almost continuously(we have a lot of hedges) plus the sawing occasions so a mix of slow,heavy & high speed duties coiupled with a spur gear set.
The original motor (made in China ,of course ) is a sealed unit of the type also used in model boats for example,& appears to have used up its brushes ,which aren't renewable.
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