Originally Posted by banjoman
I changed the oil today and installed the 2 Stens filters. After calling 2 different mower repair shops, they told me the Stens filters were great filters and they would work with no problems at all. The hopper is pulling much better now after the fluid change. Ive noticed a lot of hydro ZTR's and WB's call for the Mobil 1 15w-50 oil for hydro fluid. Is there a reason behind this?
Actually most hydro pump mfg's don't really specify synthetic! However, most all of the equip. mfg's specify Mobil1 or another brand of synthetic.
Prolly has to do with heat tolerance and lubricity/ shear strength and other such BS. ( more likely, you scratch my back etc)