I'm a Master Tech and I do not believe in that synthetic bullshit, any 10w-40 is fine in Polaris engines
Oil today is so much better than 20+ years ago, no need for it
Why use 0-40 is it always -30 where you live. The wider the spread between the winter number vs summer number cost you lubricity. I would think what you would want is 5-40 or 10-40. I hate using oil with a spread of more than 30. Like everything else it's a trade off you get a more constant viscosity but at the cost of lubricty. Unless you drive in real cold weather I would question the "0".
Polaris used nothing but 0W40 for years and everything was OK. I noticed Arctic Cat also uses 0W40 now or that is what is on the shelf at the AC dealer. How many vehicles now use 0W40 in them? Must be something good about it. Both my ATV's have over 10000 miles on them running 0W40 and they both run like new. Oils today are good enough where a 40 point spread is OK. If you don't trust the spread send in a sample and let them tell you if the oil is still OK.
And Mobil 1 at that time was expensive at $3.50/qt.
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