If you do not want to use Polaris trans oil ,they recommend 30 w engine oil
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You change the ENGINE oil and filter. There is no transmission oil.
Best bet is Polaris synthetic.
SAE 10w30 full synthetic.
There is no transmission oil, its what is considered a wet clutch the engine oil lubricates the clutch, 2 quarts will fill the engine oil.
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 .
Engine = 1900cc Transmission = 948cc Final Drive = 150cc
Locate the drain screw on the right of the transmission. Drain oil. Replace screw, then go to the left side and unscrew the fill screw and use a funnel to fill with Polaris tranny oil until its full to the screw hole.
0W-40. I use the AMZOIL blend in mine.
To check the transmission oil in a 2004 Polaris Sportsman 500, first ensure the vehicle is on a level surface and the engine is off. Locate the transmission oil dipstick, which is typically found near the rear of the engine case. Remove the dipstick, wipe it clean, reinsert it without screwing it in, and then remove it again to check the oil level. The oil should be between the "Full" and "Add" marks; if it's low, add the appropriate transmission oil as specified in the owner's manual.
Penis oil
0W-40. I use the AMZOIL ATV blend in mine.