Thanks all! Appreciate all the responses, I was worried about opening up a can of worms, as I figured grease on the forum is a hotly contested topic much like oil on car forums. It sounds like I had the right idea about which type of grease to use (just following whats in the manual), and that there will be no harm if the grease im putting into the zerk is a different brand then the one the dealer put in. Just want to make sure Im doing everything correct with the tractor, I would like it to last a long time.