I ordered a set of these to use on a composter I'm building:
Hub City PB251URX1 Pillow Block Mounted Bearing, Normal Duty, 1" Bore, Setscrew Locking Collar, Cast Iron Housing, 1.52" Length Through Bore, 1.437" Base To Height: Amazon.com: Industrial & Scientific
Yes, its overkill for a barrrel composter, but thats how I do it.
So since they have grease zerks on them to lube the bearings, I also ordered this:
Amazon.com: Powerbuilt 648755 Mini-Pistol Grease Gun: Automotive
and this:
http://www.amazon.com/gp/product/B000LDJ3XQ/ref=oh_details_o00_s00_i01?ie=UTF8&psc=1

Figuring I could also use it to lube the front end of the truck and any of the poly bushings that may start to squeak after I finally get around to installing them. (With either the installed zerk or a needle adapter if needed.)
Then I got to thinking: What if synthetic grease isn't good for poly bushings?
So I thought I'd ask. Do you use synthetic grease on your truck? What about those with poly bushings? Is it safe to use on them? If not, what do you use?
Thanks.