Mercury 4-Stroke Marine Engine Oil – 1L – 8M0078639

Protect your marine engine with Mercury 4-Stroke Marine Engine Oil 8M0078639. This genuine Mercury OEM SAE 25W-40 marine engine oil is specially formulated for use in Mercury outboards, MerCruiser sterndrives, and other 4-stroke marine engines.

Unlike automotive oils, this marine-specific formula contains advanced additives designed to protect engines operating in high-load, high-RPM marine environments. It helps maintain lubrication, resist corrosion, and prevent thermal breakdown during demanding boating conditions.

Key Features

• Genuine Mercury Marine OEM 4-stroke engine oil

• SAE 25W-40 viscosity grade

• Marine-specific additive package for corrosion protection

• Helps maintain viscosity under extreme heat and engine loads

• Reduces internal engine wear and friction

• FC-W and FC-W Catalyst Compatible certified

Mercury marine oil is engineered specifically for boat engines and provides stronger corrosion protection and viscosity stability than standard automotive oils.

Part Details

OEM Part Number: 8M0078639
Mercury Reference Number: 92-8M0078639
Product Type: 4-stroke marine engine oil
Oil Type: Synthetic blend marine oil
Viscosity: SAE 25W-40
Container Size: 1 Liter (approx. 1.06 quarts)

Compatible Mercury & MerCruiser Engines

Approved for use in most 4-stroke marine engines requiring 25W-40 oil, 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 where 25W-40 oil is specified.

Function

Engine oil lubricates internal components such as pistons, crankshafts, and bearings while helping regulate engine temperature and reduce friction.

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 engines may require 10W-30 or 25W-50 depending on model and operating conditions.

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