2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 24Get this manual
Quality of the image is intentionally reduced!
GENERAL SPECIFICATIONS EBS01001
YAMALUBE4 (20W40) or SAE 20W40 YAMALUBE4 (10W30) or SAE 10W30 SAE 5W30
Oil capacity Engine oil Periodic oil change With oil filter replacement