When I got mine I read as many of the threads on here as possible. If it looks like its been in a lot of mud and water then you may have to do the brakes and bearings, etc sooner than if it was ridden in mostly dry areas. I had mine blow up because the bolts on the intake clamps were not even finger tight. So it was sucking sand/dirt/mud. So I would look over the SXS and just see if anything is lose or not together correctly. I think the early 2018's were more prone to some issues as far as assembly from the factory . Other than that , jack it up and feel for any play in wheel and suspension. They put some wider gears ion the transaxle in the 20 and newer I think. I'm not sure how to check to see if there is a potential issue with that. Maybe a search on here will give you some tips.
With that many miles on it, you are past the timeframe that the plugged up oil filter would have caused a problem. So You should be good with the engine. They all turn over for a little bit before starting. So that is normal. If I was you I would ask the dealer to change all of the fluids . Or If you did the fluid changes Yourself you could get an even better idea of how it was taken care of. The front diff,transaxle , and engine oil of course. But look at the air filter , see if there is any dust inside that got past the filter, how clean or dirty the filter is, Look at the oil filter and see if it has the hours written on it and or the brand. might tell you the last time it was changed. look to see if you can see any signs that the drain plugs have had a wrench on them . If they look like they have been in and out a few times You'll have a better idea of how often the fluids have been changed. I would also just look at all of the fasteners that You can see and see if it looks like stuff has ben on and off. Then You might have a better idea of if it has had issues that were fixed or whatever. Look at the tires and if they are worn unevenly.
Other than the axles there is not a lot of stuff that can be seen that were known issues that I can think of. So I would look at everything you would look at on any used vehicle. There are 3 versions of Axles now and depending on the style riding you do , one may work better for you than the other. Another subject you can search on here for.
If everything looks and feels tight and clean, and original I would think it was not abused and should be a solid sxs. Put some 4 or 5 point harnesses in instead of the stock seat belts. Much safer and more comfortable in most conditions. If you ever roll it, You'll be glad you put them in. Even if you never roll it they are much more comfortable in my opinion. In prior UTV's I was stiff and sore after a ride with stock belts, and after putting some 3inch harnesses in I felt safer and drove more relaxed and did not hold on as hard since the harnesses hold you in place well. The XX suspension is so amazing that its not going to beat you up like a utility model . It was the first thing I did to mine.
With that many miles on it, you are past the timeframe that the plugged up oil filter would have caused a problem. So You should be good with the engine. They all turn over for a little bit before starting. So that is normal. If I was you I would ask the dealer to change all of the fluids . Or If you did the fluid changes Yourself you could get an even better idea of how it was taken care of. The front diff,transaxle , and engine oil of course. But look at the air filter , see if there is any dust inside that got past the filter, how clean or dirty the filter is, Look at the oil filter and see if it has the hours written on it and or the brand. might tell you the last time it was changed. look to see if you can see any signs that the drain plugs have had a wrench on them . If they look like they have been in and out a few times You'll have a better idea of how often the fluids have been changed. I would also just look at all of the fasteners that You can see and see if it looks like stuff has ben on and off. Then You might have a better idea of if it has had issues that were fixed or whatever. Look at the tires and if they are worn unevenly.
Other than the axles there is not a lot of stuff that can be seen that were known issues that I can think of. So I would look at everything you would look at on any used vehicle. There are 3 versions of Axles now and depending on the style riding you do , one may work better for you than the other. Another subject you can search on here for.
If everything looks and feels tight and clean, and original I would think it was not abused and should be a solid sxs. Put some 4 or 5 point harnesses in instead of the stock seat belts. Much safer and more comfortable in most conditions. If you ever roll it, You'll be glad you put them in. Even if you never roll it they are much more comfortable in my opinion. In prior UTV's I was stiff and sore after a ride with stock belts, and after putting some 3inch harnesses in I felt safer and drove more relaxed and did not hold on as hard since the harnesses hold you in place well. The XX suspension is so amazing that its not going to beat you up like a utility model . It was the first thing I did to mine.