Changing the engine oil in autumn is not just our recommendation, almost every owner’s manual recommends changing the oil at the end of the season, lubricating the engine and supplying it with fresh oil that contains rust-inhibiting agents. This extends the life of the engine. Although the oil filter does its job all season long, changing the oil is the only way to remove the acids that can cause corrosion and other damage to engine surfaces. Changing the oil in autumn also removes all the water before it can separate from the oil, freeze and/or cause corrosion.

Here are the steps you can follow to replace the engine oil:

1. Preparation: make sure the engine is switched off and that the boat is in a stable position, preferably in a harbour or at a safe anchorage. Gather all the materials you need, including a funnel, an oil filter, a container for the old oil, new engine oil, an oil filter wrench, a funnel and clean cloths.

Tip from Synmar: make sure your boat’s engine is up to temperature. Warm oil flows more easily and also holds more grit and dirt. This makes it easier to clean up.

2. Locate the oil drain plug: consult the manual of the onboard engine to find the location of the oil drain plug. It is usually located at the bottom of the engine and is protected by a cap or plug.
3. Place the drain pan: place the drain pan under the oil drain plug to catch the old oil.
4. Remove the oil drain plug: use a suitable wrench to loosen the oil drain plug. Make sure the drain pan is positioned under the plug to catch the oil once it starts flowing. Let the old oil drain completely out of the engine.
5. Replace the oil filter: after the old oil has been drained, you can replace the oil filter. The oil filter is usually located near the engine and can be loosened by hand or with the help of an oil filter wrench. Make sure you catch the oil that leaks from the filter.
6. Lubricate the new oil filter: before placing the new oil filter on the engine, coat the filter’s rubber gasket with a little new oil. This helps seal the filter and makes it easier to remove during future oil changes.
7. Fit the new oil filter: screw the new oil filter into place by hand until it is firmly seated. Do not use tools to tighten the filter further, as this can damage the gasket.
8. Tighten the oil drain plug: after the old oil has fully drained, tighten the oil drain plug firmly with the wrench. Be careful not to overtighten the plug, to prevent damage to the thread.
9. Top up with new oil: find the oil filler cap on the engine and remove it. Place a funnel in the filler opening and slowly pour the new oil into the engine. Regularly check the oil level using the dipstick and add more oil if necessary until the correct level is reached. Consult the manual for the recommended type and correct amount of oil for your engine. Via ourwebsite you can easily find the right oil for your specific engine.
10. Check for leaks: after adding the new oil, check for leaks around the oil drain plug and the new oil filter. If there are any leaks, tighten the plug or the filter a little more.
11. Clean up: wipe up any spilled oil and make sure the drain pan and other used materials are properly disposed of in accordance with environmental rules and regulations.

Advice
It is important to follow the specific instructions and recommendations of your boat engine’s manufacturer, as there can be variations in the procedure and materials needed for different engine models. If in doubt, you can always contact contact us for suitable advice.