Mercury 4-Stroke Marine Engine Oil – 4L – 8M0078640

Protect your marine engine with Mercury 4-Stroke Marine Engine Oil 8M0078640. This genuine Mercury OEM SAE 25W-40 marine engine oil is specifically formulated for use in Mercury outboards, MerCruiser sterndrives, and other 4-stroke marine engines.

Unlike automotive oils, this marine-specific formula contains an advanced additive package designed to handle the extreme loads, high RPM, and corrosive environments encountered in marine applications. It provides outstanding wear protection, corrosion resistance, and viscosity stability to help extend engine life and maintain peak performance.

Key Features

• Genuine Mercury Marine OEM 4-stroke engine oil

• SAE 25W-40 viscosity grade

• Advanced marine additive package for corrosion protection

• Helps maintain viscosity under extreme heat and engine loads

• Reduces wear and protects internal engine components

• FC-W and FC-W Catalyst Compatible certified

Marine-specific oils outperform automotive oils in boat engines because they include enhanced rust inhibitors and shear stability additives designed for humid and saltwater environments.

Part Details

OEM Part Number: 8M0078640
Mercury Reference Number: 92-8M0078640
Product Type: 4-stroke marine engine oil
Oil Type: Synthetic blend marine oil
Viscosity: SAE 25W-40
Container Size: 4 Liters (approx. 1.06 gallons)

Compatible Mercury & MerCruiser Engines

Approved for use in all Mercury and MerCruiser 4-stroke marine engines, including:

Mercury FourStroke Outboards

• Mercury 2.5HP – 400HP FourStroke outboards

• Mercury Pro XS FourStroke models

• Mercury Verado FourStroke engines

MerCruiser Sterndrives & Inboards

• MerCruiser 3.0L

• MerCruiser 4.3L V6

• MerCruiser 5.0L V8

• MerCruiser 5.7L V8

• MerCruiser 6.2L V8

• MerCruiser 7.4L V8

• MerCruiser 8.2L V8

This oil is approved for outboard, sterndrive, and inboard marine engines that require 25W-40 oil.

Function

Engine oil lubricates internal components such as pistons, bearings, and camshafts while helping control temperature and reduce friction. Marine engines operate under heavier loads and constant RPM compared with automotive engines, making proper oil formulation critical.

Using Mercury marine oil helps:

• Reduce internal engine wear

• Prevent corrosion from moisture and saltwater exposure

• Maintain engine cleanliness and lubrication

• Protect engines operating at high RPM and heavy loads

Important Compatibility Note

Always confirm the recommended oil viscosity in your engine owner’s manual. While many Mercury and MerCruiser engines use 25W-40, some newer models may specify 10W-30 or 25W-50 depending on engine design and operating conditions.

Shipping: Ships same or next day for fast Canada wide shipping. ⚓