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My mower has done 2 seasons domestic use with 13 hrs on the clock. It has HydroGear ZT3100 transaxles. Maintenance schedule says 100hrs to the first transaxle oil change but that would be 15 years away ! The other problem is that the mower was delivered with one of the reservoirs a bit low, and when I asked what oil had been used so I could top it up with the same stuff, they didn’t know. Didn’t fill me with confidence. So decided to change oil and filters.

Easy enough to do. Old oil surprisingly black so glad I did it.

have your model & serial #'s handy for correct parts & manuals above