i use Polaris PS-4Plus oil ....i think its like 2w-50 ....just the recommended oil from the dealer....i had Lucas 10w-40 from Autozone and it always looked thin and made my fourwheeler run hot so i switched to the manufacture oil and it runs a whole lot better!
Ok well here is my opinion! I been racing motocross for 14 years now and the past 6 years I had got on with a dealer that gives me my Ams Oil for FREE! And I run it in almost everything that I have that has a motor. And I love it, not just cause it was free but cause is was awesome! Plus racing as much as I did and all I was changing my oil every weekend and maybe twice on a weekend if it was a big event! Well this pass summer I bough me a 2010 brute 750. So since I got Ams Oil for free I ran it in my brute! But I will say as for as me I don't think I will run it in my brute no more. My motor is at DSC getting rebuild cause it was locked up! The worst dale has seen! But I did notice it did burn the oil bad! And my bike ran really hot!! The pipe would be glowing red!!! And I changed mines about every 15 to 20 hours. So as far as running Ams Oil I would say change it really often and check the leave throw riding and stuff like that! Hate to see another person have to rebuild a motor from the oil!!! But I'm wait and see what Dale thinks I should run! But if I do go back to Ams Oil looks like I'll be seeing my dealer even more cause I'll be changing it after ever ride and maybe twice on a big weekend ride!!!
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