1) Engine oil is dirtier in a diesel... more acids, carbon, etc than oil in a gasoline engine.
2) Sucking oil out a dipstick tube is less efficient than unscrewing a drain plug.
3) Two or 3 cyl marine diesels do not take very much oil at all.
Put those 3 things together and I have come up with a little extra insurance for my Yanmar 2GM20F. Bought a gallon of oil, which is roughly twice what I need for the fall oil change.
I warmed the engine to make the oil flow better. Waited a few minutes for it to drain down then started the suck out. Same time I removed the filter and poured out the oil stuck in it. Screwed the old filter back on.
When empty I poured a little less than half a gallon of fresh oil in then ran it ten minutes to get it to flush out the original oil. Then I let it drip down for 5 minutes, changed the oil filter and filled with fresh oil again. After running the engine about 10 minutes I pulled the dipstick to adjust the level and was greeted by the freshest oil I ever saw. Cost was an extra half hour and 2 qts sacrificial oil. Now I will sleep like a bear all winter knowing there is next to no acids, particulates or moisture bearing fluid in my engine.
2) Sucking oil out a dipstick tube is less efficient than unscrewing a drain plug.
3) Two or 3 cyl marine diesels do not take very much oil at all.
Put those 3 things together and I have come up with a little extra insurance for my Yanmar 2GM20F. Bought a gallon of oil, which is roughly twice what I need for the fall oil change.
I warmed the engine to make the oil flow better. Waited a few minutes for it to drain down then started the suck out. Same time I removed the filter and poured out the oil stuck in it. Screwed the old filter back on.
When empty I poured a little less than half a gallon of fresh oil in then ran it ten minutes to get it to flush out the original oil. Then I let it drip down for 5 minutes, changed the oil filter and filled with fresh oil again. After running the engine about 10 minutes I pulled the dipstick to adjust the level and was greeted by the freshest oil I ever saw. Cost was an extra half hour and 2 qts sacrificial oil. Now I will sleep like a bear all winter knowing there is next to no acids, particulates or moisture bearing fluid in my engine.