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INDIAN INSTRUCTION BOOK
TWELFTH REVISION
CHANGING TO FRESH OIL
Models 237, 337, 537 and 637—The old oil should be drained from both the tank and the crankcase every 500 to 2,000 miles—depending on the size of the motor and the conditions under which it is being driven. To change oil, proceed as follows:

Remove drain screw B (Fig. 4), and allow all the old oil to be drained off, after which replace the drain screw. 

Remove the drain plug from bottom of oil tank and allow the oil to drain off, the replace the plug screwing it in tight.

Refill the tank with fresh oil, as per instructions on page 4 under the heading "Filling Tanks".

[[image: Figure 4 - oil tank]]

Model 437 — Remove large drain plug from underneath the crankcase, also small plugs from underneath the flywheel housing and transmission case, allow all the oil to drain off, then replace all three drain plugs. Through filler cap (shown in Fig. 5) on left side of motor, pour enough oil into the crankcase to bring the level up go the fourth notch on the oil gauge. This will require about three quarts. It is necessary that the motor be run for a short time before the oil finds an equal level in the crankcase and flywheel housing.

[[image: Figure 5: diagram of Model 437 oil tank with instructions]]

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