There is currently a discussion about this subject here on lawnsite. Everyone has an opinion based on experience, but I got to wondering about how they are made; How can a sealed bearing go for 1k plus hours? So I am going to my preferred zero-turn manufacturer- What kind of engineering goes into a sealed bearing? Better grease? better seals? Will my next 72" zero-turn have sealed bearings? Why or why not? Thanks for your time.