I am sure there is a substitute for the grease but MTD uses a proprietary grease, and very little information available for weight and blend.
#3
Hammermechanicman
It probably calls for Bentonite grease.it is a clay based grease vs a standard soap (lithium) based grease. Much more resistant to water and is non hardening. Peerless is the most common brand you will see but i think Chemtool makes it for all the labels. Google "bentonite grease" and you can find a vendor.