Mercury – Oil Change Kit, 15–20HP FourStroke, 1 Liter | Maintenance | 8M0081910

Overview

These little 15 and 20HP Mercury FourStrokes don’t ask for much, but they do appreciate fresh oil. They spend their days pushing skiffs, dinghies, and small fishing rigs—idling around, getting hammered by heat, then jumping straight into work again. When the oil starts getting worn, the motor feels a bit rougher, a little slower to respond, and just not as “eager.” This kit keeps the whole job simple: the right oil, the right filter, a new plug seal, and a drip tray so you can change the oil without making a mess.

Key Features

 • Made for 15–20HP Carb FourStrokes – The oil and filter match exactly what these motors were designed to use.
 • 1L of Mercury 25W-40 Oil – Holds up to heat and long idle periods.
 • OEM Oil Filter – Helps keep the engine clean and oil pressure steady.
 • Drain Plug Seal – Fresh gasket so you’re not chasing leaks later.
 • Drip Tray – Makes the job cleaner, especially on the trailer or at the dock.

Engine & Boat Compatibility

 • Mercury 15HP FourStroke (carb)
 • Mercury 20HP FourStroke (carb)
 • Small portable 4-stroke outboards

Performance & Practical Benefits

Once you drop in fresh oil, these motors usually settle right down. Idle gets smoother, cold starts feel easier, and the engine doesn’t sound like it’s working as hard when you give it throttle. Clean oil also helps them stay cool—big deal on engines this size, since they don’t have a ton of cooling capacity to spare.

Why Buy OEM

Mercury blends this oil for marine life—salt, heat, moisture, long idles—and the filter is built to keep pressure consistent. Cheaper filters or automotive oil can cause problems you won’t notice until the engine starts acting tired. OEM parts just keep things predictable.

FAQ

Q1: How do I know it’s time to swap the oil?
A: Dark oil, rougher idle than usual, or simply hitting the hours listed in your manual.

Q2: Anything special after refilling the crankcase?
A: Run it for a minute and check the level again—it’ll settle once the filter fills.

Q3: Safe for saltwater rigs?
A: Absolutely. The oil is built for corrosion-heavy environments.

Q4: Any tip for keeping cleanup easy?
A: Warm the engine a little first—warm oil drains smoother.

Q5: What if the filter starts clogging?
A: The engine might feel sluggish, idle unevenly, or show drifting oil-pressure readings.