From the Spyder Operator's Guide pg 77:
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Use BRP XP-S 5W40 synthetic oil (P/N 293 600 039) or an equivalent motorcycle oil meeting the requirements for API service SL, SJ, SH or SG classification. Always check the API service label on the oil container.
NOTICE: To avoid damaging the clutch, do not use a motor oil meeting the API service SM or ILSAC GF-4 classification. Clutch slippage will occur.
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Take a look at the label on your Shell Rotella T Synthetic 5W40 -- it meets or exceeds all these requirements... for a fraction of the cost of BRP branded oil.
If you follow the recommended oil change interval of 3,000 miles you could PROBABLY get away with using just about ANY oil, but you SHOULD use an oil that AT LEAST meets BRP specs. Shell Rotella T Synthetic 5W40 does.
The oils that meet API service SM or ILSAC GF-4 classification you are warned to avoid may contain so called "friction modifiers" intended to reduce friction on internal engine parts and improve fuel mileage. Because the same oil that lubricates your Spyder's engine lubricates the transmission, these friction modifiers MAY interfere with clutch operation.
I've been told Shell has released a version of Rotella T Synthetic 5W40 that meets API service class SM, so be sure to check the label before you purchase and pour.
Take a look at this site:
http://www.calsci.com/motorcycleinfo/Oils1.html
Regards,
Mark