[tiggershark]

If you suspect the oil is wrong, get it out of there. Get the 0w40 A/C oil and a new filter.
Our 05 500 would hit 57 mph on pavement, get another quad or two drafting it and it would run up to 63 mph with stock tires, over inflated a tad.
Check your throttle cable adjustment on the handle bars, maybe it backed off and your not getting full throttle. There should be a little play in the thumb lever.
Take your clutch cover off and see whats happening in there, everything should still be as clean as day one with the amount of hours you have on the machine.

 

[tiggershark]

<div class='quotetop'>QUOTE (Sanny651 @ Oct 6 2009, 07:15 AM) <{POST_SNAPBACK}></div>

Here's a question that I haven't gotten an answer to (haven't asked it either though, so....). If the wet clutch is slipping due to the improper oil being in the engine and the oil is replaced with the proper oil, will the clutch then work properly again provided it wasn't ran extensively (and causing damage to the clutch shoes)?[/b]

From what I have read before, it should be fine as long as it wasn't run for an extended amount of time. Personnelly, 2 or 3 oil changes is what I would do if the wrong stuff was installed, just to be safe.

 

[tiggershark]

Can you give us an update???