Joined: Feb 2012
Posts: 19,290
Likes: 5,383
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
The Op's situation is with simialr metals. Both the shell and the Bb cartridge are Alu. I'm no chemist or mechanical engineer but i'd use marine grade grease. I also would so a break down and reassembly every year or few thousand miles, more often if there's a lot of rain. Andy.