If your need to use off brand oil, just have someone else top it off.  Problem solved. 

Sure is legal

Me and wife rode south yesterday. We did 240 kms on flat fast trails. We did full loop starting and stoping in new Dundee. Went alll way to turkey point cut off going thru drunbo, Princeton, burford, Delhi and then loop around and came back thru woofstock up to tavistock and back to Platsville to new Dundee. Some of flattest fast trails I have been on all season long. Worth trip before it's all gone 👌

Pretty sure I had that happen in the past, signed something oil related with BRP

So, was this a dealer waiver/form or a corporate BRP form is what really matters.  warranty is owned by BRP that dealer facilitates…unless you got an extended warranty through 3rd party.