PS-4 is the "Polaris" brand.
Most people use 0-W40 as per most of the internet ATV forums out there.
2 qts
0w=40 synthitic
2 qts
ATV gear lube its called pure polaris agl its 10$ a qt
1.9 quarts
Best bet is Polaris synthetic.
If you do not want to use Polaris trans oil ,they recommend 30 w engine oil
Polaris Blue, Polaris is the only one who makes it and it is recommended with most polaris snowmobiles. If it is high performance, u should use the Premium synthetic GOLD
You should use Polaris ps-4 synthetic oil for year round use. l
Polaris has its brand of hub oil , which is not cheap . Ford ATF :automatic transmission fluid is recommended if you do not want to pay for Polaris oil .
quaker state motor oil
The Polaris 400 Sport can use any as a be certified motor oil. The manufacturer recommends a 10W-30 motor oil.