Back to the original topic of this thread, I was curious also because I accidentally bought some of the XPS 4T oil and haven't used it because I thought it was wrong for my RS. I contacted XPS and asked them about it. Here is their response:
XPS_Lubricants <
[email protected]>
11:55 AM (37 minutes ago)
to me
Hi Gary,
Thanks for the question.
The new bottle has the same 5W-40 oil as previously used and called Summer Grade, we just updated the packaging with new labels and bottle design.
In terms of the literature that recommends prior oil generations, the reason for the recommendation to NOT use SM is that many formulations with this API service level are formulated with types of friction modifiers that cause wet clutch slippage. XPS is formulated with precise friction to optimize the wet clutch performance of the Spyder, yet maintains API SM service level.
So most oils in the market that say API SM would not meet the specific requirements for Can Am, however the XPS product does meet the requirements for the clutch as well as meeting API SM service levels.
Thank you,
XPS Lubricants