How to change outboard lower unit oil
Changing the Gear Lube in the Lower Unit boat motor
1. Get all the tools and materials you need before starting. This will include: Large, flat-head screwdriver, oil drain pan, rags to clean up spills, new lower unit oil, of the engine manufacturer’s recommended brand and type, lower unit oil pump, and any necessary adaptors or fittings.
2. Locate the lower and upper drain plugs, which will be plugged with a screw. After placing the drain pan under the lower module, remove the lower screw. The oil will start to drain slowly.
3. By doing this, remove the upper screw. This will allow air to flow from the lower oil drain plug, displacing the oil, and the residue will drain quickly. Tilt the engine slightly down if necessary to ensure all the oil has drained.
4. Screw the oil pump fitting into the lower drain hole.
5. Screw the pump to the bottle with the new oil and start pumping. Continue to pump the oil until it begins to drain from the upper drain hole.
6. After the oil has flowed through the upper drain, plug the upper drain hole with the drain plug screw. Then remove the pump fitting from the lower drain hole. The oil will drain slowly as the upper screw restricts airflow, but you still want to insert the lower screw as quickly as possible to minimize the amount that comes out. (You may wish to use your finger to plug the hole as you remove the oil pump fitting and reach the drain plug screw and screwdriver.
How often should you change outboard lower unit oil?

How do I change the oil on my lower-end outboard motor?
how to change outboard gear oil
How to replace gear oil in lower unit (outboard motor)
How do you change the oil on a Mercury lower unit?

What kind of oil goes in the lower unit of an outboard motor?
I use Quicksilver gear lube oil SAE90 for boat engines.
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