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How much oil do I put in my Honda GX390 13hp Pressure Washer. Theres no lines on the Dipstick

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Capacity is 1.16 U.S. quart - The 1st solution provided actually works, but if you are looking for the procedure listed in the Honda GX390 manual here it is: Unscrew oil fill plug and clean it off. Then insert it back into the hole but don't turn it in, just press it up against the front edge. The oil level should be up to the neck of the stem that's inserted. Oil should be present half way up the stick at the very minimum.

Posted on Sep 25, 2013

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You fill the oil up to the dipstick hole,just so it doesn't over flow out.

Posted on Dec 20, 2010


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Here's a link to your Simpson manual:
No oil is required for the pump.

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