Wet mod for 2018 starter

[GG221]

I have read people mentioning the wet mod for the starters so just a couple quick questions. Basically what I am understanding is to plug up the hole in the bottom of the ignition housing, remove the starter and bendix and clean all of the grease off everything , put it back together and dump 4 ounces of 5W fork oil into the bendix assembly. Is that it? Am I missing something or any other tips? Also does this oil ever need to be changed?