I recently read that Rotella T6 5W40 synthetic is a great oil for the Traxter engine and transmission. Anyone have experience with the best oil for these machines? Been using regular 5w40 oil, but thinking synthetic might be better for the tranny?

I’ve had mine about 2 years and thinking it’s about time to be changing the coolant even though it still looks and tests ok. Can’t find any info in the manual beyond "Can Am coolant", so wondering if it is something special, or if good ‘ol Prestone will work just fine?