I'm going to oil bathe this shimano nexus 7.. the proffesional bike repair person I asked to do this for me sprayed wd40 in it, €80 later I decided to just buy
Shimano Nexus/Alfine 3, 4-, 7-, 8-, and 11-Speed Technical Information
SOLVED: Shimano Nexus 7 Hub SG-7C18 Lock Ring Problem - Ambience
Review: Foffa Urban 7 Speed Nexus bike | road.cc
Shimano Nexus 7 and 8 gear adjustment - YouTube
Nexus 7 friction
Nexus 7 friction
Nexus 7 gear hub] Replace core assembly? - Bike Forums
Nexus 7 friction
A simple guide to adjusting a Shimano Nexus hub gear | As Easy As Riding A Bike
How to setup and adjust a Shimano Nexus Inter 7 hub gear bicycle DIY - YouTube