Mercury Outboard Oil Change Kit – 75, 90 & 115 HP EFI Four-Stroke Engines (FC-W 25W-40)

The amount of oil included in this kit is adequate for most of the specifically noted Mercury outboard models. If your particular outboard requires additional oil, please be sure to purchase this separately.

Overview

Keep your Mercury EFI Four-Stroke engine performing at its best with this OEM oil change kit. Designed specifically for 75–115 HP EFI Four-Stroke models (2006–2014), this kit includes Mercury FC-W 25W-40 marine engine oil and a genuine Mercury oil filter for a smooth, reliable oil change.

A Mercury 115 oil change usually includes warming the engine, draining or extracting the old oil, replacing the oil filter, installing a new drain seal if needed, and refilling with the correct FC-W marine oil. Capacity varies by model, so always confirm the level with the dipstick after running the engine.

A Mercury 115 4-stroke usually takes NMMA FC-W certified marine 4-stroke oil, commonly Mercury or Quicksilver 10W-30 or 25W-40 depending on temperature and use. This kit includes Mercury FC-W 25W-40 oil for the listed compatible engines, but you should always confirm the recommended viscosity and fill amount by engine serial number.

Kit Contents

• 1 gallon + 2 quarts of Mercury FC-W 25W-40 Marine Engine Oil
• 1 × Mercury Oil Filter (35-877761K01, Genuine OEM)

Compatible Engines

• 75 HP EFI Four-Stroke (2006–2014)
• 90 HP EFI Four-Stroke (2006–2014)
• 115 HP EFI Four-Stroke (2006–2014)

Mercury FC-W 25W-40 Marine Engine Oil

Unlike automotive oils, Mercury’s 25W-40 FC-W Marine Oil is engineered specifically for marine conditions—developed over more than five years by the world’s largest marine engine manufacturer. Mercury 25W-40 Synthetic Blend Outboard Oil meets or exceeds the stringent marine operational requirements for all Mercury/MerCruiser 4-stroke marine engines and is first-in-class for FC-W durability with industry-leading internal corrosion protection.

Key benefits

• Approved for many 4-stroke marine engines, including outboards, sterndrive/inboard, and high-performance models where specified.
• Meets and exceeds FC-W® certification standards for marine engine protection.
• Outstanding corrosion resistance, wear protection, and viscosity stability under heavy load.
• Proven durability in both saltwater and freshwater environments.
• Helps protect Mercury EFI Four-Stroke engines during high-RPM, high-load marine operation.

Why this oil performs better

25W-40 Synthetic Blend shows superior shear stability and lower volatility, with higher viscosity and High-Temperature High-Shear (HTHS) after shear versus popular competitive formulations. Many competing oils rely on viscosity modifiers (VM) that can shear down at high RPM; Mercury’s formulation minimizes VM, helping it hold viscosity in high-revving, long-running conditions—improving bearing protection when the engine needs it most.

How to Use This Oil Change Kit

1. Warm the engine briefly so the oil drains or extracts more easily.
2. Drain or extract the old oil into an approved container.
3. Replace the drain-plug gasket or seal if worn or required by your service procedure.
4. Replace the old filter with the included Mercury 35-877761K01 oil filter.
5. Refill with the fresh Mercury FC-W 25W-40 oil from the kit.
6. Check the dipstick, run the motor briefly on a proper water supply, shut it down, and let the oil settle.
7. Recheck the oil level and top off if needed. Verify there are no leaks around the filter or drain area.

Always confirm your exact oil capacity, oil viscosity, drain seal requirements, and torque settings in your Mercury owner’s manual.

Optional Add-On: Oil Analysis

Wondering how well your oil is protecting your engine—or want early warning on issues? PartsVu partners with Blackstone Laboratories to offer professional oil analysis kits. Results arrive by email within a few days, giving insight into engine wear and oil performance. Shop now.

Frequently Asked Questions

What is included in this Mercury Oil Change Kit?

This kit includes 1 gallon + 2 quarts of Mercury FC-W 25W-40 Marine Oil and one Mercury OEM oil filter (35-877761K01).

Which engines is this kit compatible with?

It fits select Mercury EFI Four-Stroke outboards from 75–115 HP, covering 2006–2014 models. Always confirm compatibility by engine model and serial number before ordering.

How do I change the oil on a Mercury 115 4-stroke?

A Mercury 115 oil change usually includes warming the engine, draining or extracting the old oil, replacing the oil filter, installing a new drain seal if needed, and refilling with the correct FC-W marine oil. Capacity varies by model, so confirm the final level with the dipstick after running the engine.

What oil does a Mercury 115 4-stroke take?

A Mercury 115 4-stroke usually takes NMMA FC-W certified marine 4-stroke oil, commonly Mercury or Quicksilver 10W-30 or 25W-40 depending on temperature, use, model year, and serial number. This kit includes Mercury FC-W 25W-40 oil for the listed compatible engines.

How much oil does a Mercury 115 4-stroke take?

Oil capacity varies by Mercury 115 model and whether the oil filter is replaced. Use the amount listed in your owner’s manual as a starting point, then run the engine briefly and confirm the final level with the dipstick.

How do I use this kit?

Warm the engine, drain or extract the oil, replace the filter, refill with the included Mercury FC-W 25W-40 oil, and confirm the level according to your owner’s manual.

Where can I buy this kit?

This genuine Mercury oil change kit is available directly from PartsVu, an authorized Mercury dealer.

How much does it cost?

Prices vary depending on stock and promotions. Buying the kit is usually more cost-effective than purchasing oil and filters separately.