If you have a Yanmar engine...
There is a hose that is connected to the oil pan in place of the drain plug directly under the oil filter that will have an end cap. This hose is used to drain the oil into a waste container.
Download the service manual located at the address below and follow the instructions in the manual.
http://www.martindiesel.com/Documents/New%20TNV%20DIRECT%20Service.pdfHope this helps.
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