I spoke to a dealer last week and we discussed the pros and cons of either getting new equipment or buying used. On the used equipment side he pointed out that I should be careful of what I get because one should change oil every 40 hours of work. I didn't know about this, and he also said that many times users forget to do this. This would be one reason for him buying used equipment from them and selling them new as they had more money for the new stuff. Does this sound like the industry norm or is this simply a way to sell me only on new equipment??