Although you can use automotive grade oil I don't recommend it. Water cooled engines operate at 200 deg. and below. Air cooled engines run between 350 - 370 degrees. Automotive oil designed for water cooled engines has a thermal breakdown of around 250 deg. Oil for air cooled engines have a thermal breakdown at around 400 deg. You really want an oil designed for motorcycle, atv, or v-twin air cooled engines.
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