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for decades we brought our boat to the local marina for general maintenance, oil-changes and fixes. It was just the cost of having a boat. Oil-changes were part of the overall bill and never cheap. After some youtube browsing I came across a guy in Florida showing how oil changes are done on Volvo Penta engines. I could not believe how easy, clean and fast it was. Long story short, I bought the recommended Jabso vacuum extractor pump, the respecitive oil filter from NAPA and oil from Canadian Tire when their Penzoil sale was on. (<30 bucks per 5l, full synthetic premium). Did the oil-change after a few a boat ride, (after another 15+ minutes of cool down time). The pump sucked it out via the dipstick pipe effortless. Be a little careful, the oil is still warm to hot and the pump has a metal housing => pump gets hot as well. after roughly 3 minutes pumping, the oil was out, not a single drop spilled in the boat. Filter change was slightly harder due to the location of the oilfilter on our 4.3GL Volvo. with the right filter crown socket that wasn't too hard either. Pro Tip: Put a ziplock bag over the filter when removing the old one, this catches some oil that is dripping out of the filter when removing. All in all, can highly recommend that pump. Cost is around $80 CAD in most cases.
You have to make sure the oil is up to operating temperature, if you have 2 engines you will have to run the 2nd engine again prior to using the pump as the oil must be worm/hot for it to flow... this pump require you to continuously pump, only took 15 -20 minutes per engine (Mercury 496 MAG DTS). Works great only engines with threaded dip stick.