Replying to Legal help needed!

So, NS is probably the worst place for legal help, but if you have any advice lets hear it. A month or so ago a couple of my friends and I threw down on an RV. Went to look at it, ask the guy some questions ect. He tells us he "just replaced all of the engine fluids." We planned on taking it to a shop to get it looked over thoroughly once we could get up some money, but we were short on money and chose skiing until thanksgiving break, then we were going to take it to the shop over break. Well, last weekend driving home it gets stuck in first. Great, transmission shot. Take it to a shop and they said our transmission fluid burnt up because it was so old. We went back to the shop a day later with a truck to unload all of our stuff from the RV and walk in to puddles all over, this was the first rain Earl had seen. This brings us to another lie told buy the selling. He said he had just recently resealed the roof. What I ask you NS is was there anything illegal in telling us he replaced all the engine fluids or was that really up to us to go through and check all of the fluids? I'm hopefully going to call the guy later tonight when one of my buddies gets out of class and would like to go into this conversation with the most knowledge possible, we aren't looking to fuck him over legally, we just want our damn money back because we were broke, and now our ski house is gone.