I'm starting to think I got lucky. I bought my 3550 last fall. I did about 20 minutes of bush hogging, then fed hay with it all winter along with moving a little dirt with the bucket. I just finished about 3 solid days of bush hogging and haven't noticed any leaks, but I haven't gone over it with a fine tooth comb yet.
Things I've noticed: I found that I had to feed hay in 4wd because the big bales made the rear so light that I couldn't get traction (industrial tires full of fluid). I bent the steering tilt cylinder right off the bat. It was an easy fix but I felt the mechanism was a bit cheesy. One big issue has to do with the loader, which isn't made by Mahindra. I can't grease the top zerke on the loader because I can't get a straight shot on the zerke. I can get it on, but not straight enough to seal so it just squirts out around it. Other than that, my biggest issue is that I'm tall and I have to reach for the wheel to have my legs comfortable and to have my arms in position for the 3pt hitch lift levers, or scoot the seat up to be more comfortable with steering and shuttling, but have my legs cramped up. I'm thinking about rigging an extension on the steering wheel tilt cylinder to get it to tilt farther back. I'll have to open it back up to see what it will take to get more travel.