Marine Engine Maintenance

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Boating Know How

How to Change The Oil On Your I/O Boat (Video)

A video demonstration on how to change the motor oil in your boat I/O drive boat. Presented by Don Dunphy ... read more



Hi, I’m Don, and I’m a 175 owner and I just got over my twenty hours of the break in period so it’s time to change the engine oil and the gear lube.

In order to change the engine oil, I took the boat to the water and I ran it for about 15 minutes and brought it up to operating temperature. Now I brought it back here to the yard. Most of this work is taking place on the outside. But some of the work is taking place inside in the engine compartment. I’ll show you all those components today.

So to begin you remove the drain plug from the back of the boat. You then pull on that and you’ll get the oil drain hose connected. Clamp on the vice grips, not too tight. Get the quarter inch on there, and I’m pulling away from that. There may be some paint around here when you initially tried. Take that off now.

Pull it out. Remove your dipstick, and the oil filler cap to allow the oil to flow more freely into your recyclable container. When the recyclable container is almost full, then you’re going to want to replace your oil filter. Remove your oil filter by attaching an oil filter wrench. Turn counter clockwise until you can loosen it with your hand. For this procedure, you’re going to want to put papers or rags down in the bilge pump area to catch any loose oil.

For your new filter, you’re going to want to lubricate the seal by dipping a small amount of oil on your finger and running it around the seal. The other thing you are going to want to do is to go down to the area where you removed the old filter and clean it off before you install the new filter.

Twist it back in again. Getting very little resistance here, that’s good. They were pre-adjusted when I took this off. I’ve got my quarter inch. And just rotate that. Okay, now I’m going to tuck this back into the boat. And now we put the cap on this. And you can see it’s not quite full, but we did have some in the filter and the bottom of the bilge.

Okay, so here we are back at the motor compartment and I’m going to be putting in some new motor oil. I’ve got this mercruiser SA 20 5w-40w. Which is the manufacturer’s recommended oil. Opening up the lid oftentimes you’re going to find the safety seal on the inside. It’s always good to have something to puncture that or just use your thumbnail.

You may want to use a funnel for this or have a rag handy because of spills. So I have a rag handy. And here we go. Simply let it flow right in. Goes in nice and smooth. And just leave that bottle to drain out. It says that it will hold 3.8 liters. I have four bottles here, so it should take up most of those. It’s likely it is not going to take them all right away. It will take some time to get down into the oil filter. They say to check it again after your first time out on the water. Okay, when you are done with all four, you want to take a rag and clean around here. Take the cap and position it the same way you found it. Put one side in. And that’s it.

Once you let all that oil go in, you want to go over here to the dip stick, pull it out, bring it up, and have a look and see where you are. See there. It’s okay, but it still hasn’t gotten into the lower parts of the engine. We need almost all four bottles in there to know that’s going to be full. You don’t want to over fill it, and you don’t want to under fill it.

So now that we have finished our oil change, let’s recap:

Step 1 – Warm the Engine

Step 2 – Drain the oil

Step 3 - Replace the filter & the Plug

Step 4 – Add the new oil

Step 5 – Check all the oil levels



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How to Change the Gear Oil (Video)

This video gives a step by step process on changing the gear oil in your boat outdrive. ... read more
What you will need: oil pump, flat-head screw driver, oil pan and enough lube for your motor.



As seen on the video, a quick recap of changing your motors gear lube.


1. Raise out drive to up/out position, like when trailering.
2. Empty monitor reservoir/tank.
3. Remove lower & upper drain plugs, in that order.
4. Lower out drive and let lube drain out.
5. Pump lube until visible in upper vent hole.
6. Replace upper vent plug.
7. Pump lube until visible in monitor reservoir/tank.
8. Replace lower fill plug.
9. Top up monitor reservoir/tank.


First step is to raise the engine to its upright position similar to its position when trailering. Removing the monitor tank on your motor comes next, remove the strap holding it in place to make this next step easier. Remove the lid and empty the tank into a container, and not on the ground. Be cautious for the surrounding wires, and make sure not to spill on anything. After emptying, put the lid back on and strap in to place so that you do not lose any parts.

Now we move around to the out drive for step 3, which is removing the lower drain plug. Be careful when doing so, and have a bucket ready, gear lube may start to squirt out when removing the plug. Remove the drain plug using a screw driver, be careful not to lose the washer surrounding the screw. With that being done, we want to remove the upper vent plug using a screw driver. When you remove the vent plug, the lube will start flowing much more from the lower unit.

Next step is to lower your out drive for the lube to drain out. Use a gear lube pump to fill the motor back up. Make sure you’re using the proper pump for your motor, and follow the pumping directions. Most likely you will need more than one bottle of lube, and are probably wondering how you would switch them out. Put the upper vent plug back in a little bit so that air cannot enter and push the lube out. Once you have the bottles of lube switched out, remove the vent plug and continue pumping lube back in. Stop pumping when you see lube begin to flow out of upper vent plug. Once this happens, screw the plug back in so that you can pump lube into the monitor tank.

Now that you’re ready to fill up the monitor tank, remove the lid and strap holding the tank in place. Begin pumping until you see the tank fill up with the lube you have left over. After the bottle of lube has finished, place the lid and strap back on the tank. Placing the lid back on the tank locks the air in place and allows you to remove the lube pump you are using. Be careful when doing so, as some lube may still leak out. The best practice is to have your screw and washer ready in one hand, while removing the pump hose with the other.

The final step is to top off the monitor reservoir/tank. If you have any additional questions, please be sure to check out our Boating Forums.
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