In order to thoroughly drain all the old oil, you will need to run the boat engine long enough to reach at least 140 degrees F (approximately three minutes in most applications), before changing the oil. Do not run your engine without it being in water, unless you have the appropriate, professional hook up available to protect the engine and drive train components. If this is not available to you, have your MasterCraft service technician perform this service.
Step 1: Ensure the engine is OFF and the engine safety starting switch disconnected. Be certain that the throttle shift control lever is in neutral. The engine must be warm.
Step 2: Open the engine compartment and locate the oil drain hose, which runs from the bottom of the oil pan along the port side of the engine. At the end of the oil drain hose is a brass plug.
Note: Never drain oil into the bilge or into the water. Wipe up any spilled oil immediately, and dispose of the rags and drained oil in a proper manner on-shore.
Step 3: Remove the engine oil cap located on the valve cover. This will speed up the oil draining process.
Step 4: Remove the bilge drain plug to drop the drain hose through the hole. Drain the oil into a container on the ground. (On some v drive models, you will thread the line through a hole that runs through the lower edge of the transom.)
Step 5: Loosen the brass end cap to allow the oil to drain; be careful to avoid rounding off the edges of the brass end cap.
Step 6: The oil filter should be changed each time the oil is changed. Remove the oil filter and dispose of it properly onshore.
Step 7: Fill a new MasterCraft oil filter about half full with clean engine oil. Lightly lubricate the oil filter gasket and spin the filter on until the gasket makes contact. Hand tighten the filter one quarter to one half turn after contact. DO NOT use a filter wrench to tighten.
Step 8: Re-attach the oil drain plug to the end of the hose and refill the crankcase through the oil cap opening on the valve cover. Check the oil level with the dipstick. If this is the initial quarterly oil change, re-attach a cable tie around the oil drain hose and the water line on the port side of the engine as it came from the factory, to keep the line from coming in contact with any hot areas.
Step 9: The first time that you re-start the engine when it is back in the water, check the area around the filter for any leaks.
Step 10: Stop the engine and re-check the oil level. Add more oil if necessary.
Note: The engine oil recommendation for all engines is SAE 15W40 oil, rated at SJ/CH4. This rating requires oils to have higher additives levels than typical gasoline engine oils to compensate for potential thinning or fuel dilution. Any other rating other than SJ/CH4 may result in damage or excessive wear to the engine and should be avoided!