I get Mobil SHC 100 (Aviation grade) synthetic grease through work. It's overkill but in a good way. I usually grease my vehicles once. The only time I have to go back is if I replace a part. It's intended use is aircraft landing gear joints and aircraft wheel bearings. It's mil-spec too. I've never priced it outside of work though.
EDIT: It's about $20 a tube. It's rated for such an extreme temperature range I'd put it on/in anything. This is what I use, but really any synthetic grease will work. You can get tubes of Valvoline synthetic at any auto parts store and it will do the job.
This post was edited by FMX_89 on Jun 17 2014 07:00pm