We have found out that having a roll over ( simple) not repetetaly the ROV kit is not really needed. less than a thimble of oil ever leaks out.
if your stuck and need to roll the sled over- you don't really need it. Whenm we do see you need it is when your in a position where the sled is belly up for a period of time.... or are we missing something here...
S/C
Mainly it depends on the situation, such as the angle the sled is sitting at, engine running or not, how long the sled been has on its side, etc.
As Gene mentioned above, even small amounts of oil leakage can build up in the stock air filter and over time cause the filter to become oil soaked.
If the engine is still running while the sled is rolled, the positive crankcase air flow (from the running engine) will actually pump the oil out through the breather line. In this situation you can loose a lot of oil in a very short period of time. I have seen oil leak out to the point where it gets on the clutches/belt, exhaust etc.
A standard tether (without a ROV) helps, but doesn't solve the problem if the sled is on its side for an extended period of time, ie. stuck in a tree well or on the side of a hill
From personal experience its kind of a p.i.a. when the oil leaks out! It makes a mess, if it gets on the clutches then you have to clean the clutches and put a new belt on. I had one customer tell me that he lost quite a bit of oil and it got on the exhaust which caused a small oil fire. (he was able to put it out ok).
Then there is the issue of the low oil level light coming on while out on a ride and having to add oil (if you have it) so you can keep riding.
Often times I will use the ROV to get unstuck. What I will do is turn on the roll-over valve, flip the sled on its side and drag it around. Then flip it back to rubber side down, plug the tether back in and your good to go!
Because the ROV valve is closed, it allows the rider to take his/her time while the sled is on its side. It takes the pressure off of being in a hurry and allows you to maybe catch your breath or wait for a buddy to give you a hand!
With a ROV kit installed there is one less thing to worry about and I can just enjoy the ride
Bill