Dixon ZTR 5020 Operator's Manual page 40

CARE AND MAINTENANCE
HYDROSTATIC TRANSMISSION OIL AND FILTER SERVICE
SERVICE INTERVALS:
OIL REQUIREMENTS:
RECOMMENDED OIL WEIGHT:
Page 38
1 . Initial oil and filter service - 50 hours.
2. Every 250 hours thereafter.
Any high quality engine oil with an API classification of SG/CD is
recommended.
Normal operation temperatures - 20 W 50
Cold climate usage - 10 W 40
Another alternative that will provide excellent all climate
performance and extended time between oil changes is a
15 W 50 synthetic engine oil.
OIL FILTER: P/N 5565 - IMPORTANT
The oil filter is a special 10
micron design for use on
"vacuum or suction" oil flow
systems.
DO NOT: Use automotive engine oil filters.
These filters require a "pressure"
to allow oil flow. Usage will result
in an "air-lock" condition with
possible damage.