20w50 in zero turn hydraulics

[SuzukiGoat]

I've got a bad boy mz 48 zero turn mower. Hydraulic system is sealed, filterless, and specs 20w50.

Any benefit Tp running full synthetic?

Changed every 100 hours or two years, whichever comes first.

 

[doitmyself]

The owners manual says: "The hydrostatic system on MZ models is a sealed lifetime
transaxle system, so no maintenance is required."

Is there some way to drain and fill it?

 

[901Memphis]

Usually sealed units still have a odd plug for draining and filling. Just gotta find it. If it has a dipstick you siphon through the hole.

 

[SuzukiGoat]

I've yet to examine closely, but I do wish to drain and fill. Nothing is that sealed to me.