what size nut is on the blades on a john deere z225 42 in mower
There isn't a oil filter on the z225
As with any mechanical item, condition is everything. If everything works properly, no accessories are missing, and the hours of use are low, it will be worth more than one that has been left out side a lot, has high hours, is missing parts, etc. It also makes a difference depending on which deck size, engine options, and other items you may have purchased with it and would be selling with it. Since you don't mention any of those things, it's really not possible for anyone here to give you a rough estimate.