Oil change - frequency and type to use for WR450

How often should I change the oil/filter in my WR450? Also, what kind of oil should I use? I've heard some use 20W-50 automobile oil.

I run 10w40 Castrol ACT-EVO synth MC oil year-round. Change it every 600 miles or after an exceptionally brutal ride/race...the filter can go 2-3 oil changes.

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