Keep gear lube in and saltwater out with Suzuki’s Oil Seal 5.2 × 12 (09289-06003)—the palm-size gasket that protects dozens of DF-series outboards, from 25-horse tillers to 90-horse workhorses. Pressed into the shift-shaft bore and several auxiliary pump housings, this seal guards the point where a 5 mm shaft exits a 12 mm pocket, an area factory engineers call “the last line of defense” against emulsified oil.

Why the genuine seal pays for itself

• Double-lip nitrile construction grips the shaft on both sides, blocking seawater while holding 80 W-90 under full-throttle pressure.

• 316-grade garter spring maintains even tension through temperature swings from chilly dawn launches to 200 °F hot-soak.

• Precision-molded 5.2 mm ID / 12 mm OD drops straight into the factory seat—no shims, no RTV.

• Chamfered lead-in edge lets you slide it over splines without nicking the sealing lip.

Swap it during any lower-unit reseal or when chasing that milky gear oil at haul-out. A five-minute press-fit restores factory tightness, keeps bearings happy, and spares you from a costly gear-case overhaul down the road—small seal, big peace of mind for every Suzuki owner.