I thought the bad bearings were the rubber sealed type?

As far as grease I use Super Lube on my Tamiya Tiger and Sherman even in my gearboxes and turret ring this stuff is fantastic;



Water & Saltwater resistant

More reliable lubrication, outlasts petroleum based greases and oils

Remains free flowing in freezing temperatures
Will not stain or harm wood, rubber, leather, plastics, fabrics and paint.

Won't drip, run or evaporate

Repels dirt, dust, grit and grime

Prevents rust and corrosion while reducing friction

Long Lasting

Compatible with conventional lubricants

Reduces friction and wear

Reduces Maintenance