Note there is also a bearing at the tail end that needs lubrication.

I have never read of anyone recommending a specific lube but I have not looked deeply into that and read a bunch of threads on that. However, there is lube for plastic gears and an internet search would reveal some companies.

When I tool apart the W123 motor I used wheel bearing grease on the worm gear end. Will that do something to the Plastic gear? I don't know. Also I live in S CA and so I don't have to deal with Winter weather making the grease I put in the Window Motor get too thick to work.

In the past people used to use Lubriplate on all kinds of things. Lubriplate is a thin white colored grease. I don't know if it can be used on plastic gears or not but I would guess a visit to the companies site would answer that.

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84 300D, 82 Volvo 244Gl Diesel