OEM Outboard Oil Drain Plugs & Gaskets

The drain plug gasket is the most commonly skipped part of a DIY outboard oil change, and a reused one is a common cause of a slow leak afterward. A copper or aluminum crush washer is designed to deform once. Refit a flattened one and it may not seal, which leaves oil on the transom, in the bilge or in the water.

This collection holds engine oil drain plugs, drain plug washers and the gaskets for the upper and lower gear oil plugs on the lower unit, for Suzuki, Honda and Yamaha outboards. They are inexpensive parts that should be replaced at every oil and gear oil service. To see one brand only, go to Suzuki drain plugs and gaskets, Honda drain plugs and gaskets or Yamaha drain plugs and gaskets.

Frequently asked questions

Can I reuse a drain plug washer?

No. Crush washers are single use. Fit a new one every time the plug comes out.

Do the gear oil plugs need new gaskets too?

Yes. The lower unit has a drain plug and a vent or level plug, and each has its own gasket. Replace both at every gear oil change to keep water out of the gearcase.

Which gasket fits my motor?

It varies by engine family. Look up your motor in the Suzuki parts diagrams or Yamaha parts diagrams, or send us the model and serial number.

Are gaskets included in oil change kits?

Yes. Our oil change kits include the drain plug gasket, and the Complete kits include the lower-unit plug gaskets as well. Buy them here individually if you service with bulk oil.

Boat Max Online is an authorized dealer for all three brands; every part is genuine OEM. Free shipping on orders over $149 to the lower 48 states.