20W-50 Hydro System Oil: 1 gallon; 20W-50 Hydro System Oil: 1 quart; 80W-90 Gearbox Lubricant: 6 ounce bottle;. Only eligible on select new/unused Scag mower models purchases. Promotional pricing cannot be combined with any other Scag program, such as Simply the Brave, and does not apply to service parts, clothing or other promotional items... Scags use 20W-50 motor oil as fluid in the hydraulic drive system. You will never find 20W-50 "hydraulic" oil. I don't recommend using 20W-50 synthetic motor oil in a Scag, however I have switched to synthetic motor oil in the hydraulic drive systems on other brands of machines both ZTRs and GTs. Mad Mackie in CT:biggrin::laughing:
Add 20W50 motor oil if needed and be sure to not overfill. Step 3: Wipe down the fill cap again and place it back on the reservoir. Changing Hydraulic Oil. Step 1: Be sure that you have the mower parked on a level surface and that the engine is turned off. Step 2: Find a container that is appropriate for holding hydraulic oil. Place the.. Was wondering if there was a particular oil that would be better than another? one that would be better suited for hydraulic use? would scag brand oil be any better than a 20w50 off the shelf? Or hydro oil from another mower manufacturer that has made their oil specific for mowers? I am a big fan of synthetic, but i am not sure the scag would.