Toro TX 420 Operator's Manual page 39

A. Add a petroleum based stabilizer/conditioner to
fuel in the tank. Follow mixing instructions from
stabilizer manufacturer. (1 oz. per US gallon). Do
not use an alcohol based stabilizer (ethanol or
methanol).
Note: A fuel stabilizer/conditioner is most effective when
mixed with fresh gasoline and used at all times.
B. Run the engine to distribute conditioned fuel
through the fuel system (5 minutes).
C. Stop the engine, allow it to cool and drain the fuel
tank using a pump type syphon.
D. Restart the engine and run it until it stops.
E. Choke the engine.
F. Start and run the engine until it will not start again.
G. Dispose of fuel properly. Recycle as per local
codes.
Important
Do not store stabilizer/conditioned gasoline
over 90 days.
12. Check and adjust the track tension; refer to Adjusting
the Track Tension, page 30.
13. Check and tighten all bolts, nuts, and screws. Repair or
replace any part that is damaged or defective.
14. Paint all scratched or bare metal surfaces. Paint is
available from your Authorized Service Dealer.
15. Store the traction unit in a clean, dry garage or storage
area. Remove the key from the ignition switch and
keep it in a memorable place.
16. Cover the traction unit to protect it and keep it clean.
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