My tractor comment was referring to A4 variants which were previously used on jeeps and small farm tractors etc. When the engine is mounted up on a frame a "drain plug" at the very bottom and side of the pan is accessible but on a boat it is not unless you want oil al over the bilge/engine compartment etc. I use a 12 volt electric pump and sometime a vacuum pump through the dipstick tube to change oil [couple times a season, especially for winter layup]. Regardless how far down I play with the change intake tube I still get about an additional 1/2 qt of pretty dirty oil using the low right side hand pump. Probably no problem if it was left in since it gets mixed with new oil but if I can get it out I do. I remember as a young engineering student 50 yrs ago reviewing some SAE "wear" charts and became fastidious about changing oil especially when there is no filter. I
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