- 1). Warm up the oil in your MerCruiser. Run the engine for 10 to 15 minutes prior to pumping the oil out of the engine.
- 2). Remove the dipstick. Attach the oil hand-pump to the threaded nozzle at the end of the dipstick tube. The end of the hand pump's hose should twist onto the threaded nozzle at the tube's opening.
- 3). Remove the cap on the oil fill-tube. Pump the oil from your MerCruiser using the hand pump. Pump the oil into an empty oil tray or other receptacle.
- 4). Remove the oil filter using a strap wrench. Wipe off any excess oil that spills from the oil filter. Clean the attachment point and the attaching end of your new oil filter.
- 5). Attach the new oil filter. Fill your Mercruiser with 5 qt. of 15W-30 engine oil.
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