I like synthetic chassis lube it works as well but not affected by temp and doesn't pack off to the side and not lube the steering gear. I have taken steering boxes apart lubed with petroleum base grease and they were ruined because the grease had packed to the side and hardened. Since I switched to synthetic I have never had a problem. Just my thoughts.

Been there, Done that, Hope to live long enough to do it again.
Big Bill
I.I.# 4698