Mercury 4-Stroke Oil 4L 8M0078638
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Mercury 4-Stroke Marine Engine Oil – 4L – 8M0078638
Protect your marine engine with Mercury 4-Stroke Marine Engine Oil 8M0078638. This genuine Mercury OEM SAE 10W-30 marine engine oil is specifically formulated for Mercury outboards and other 4-stroke marine engines.
Unlike automotive oils, this marine-specific formula is designed to withstand the constant high RPM, heavy loads, and corrosive conditions typical of boating environments. It provides excellent wear protection, corrosion resistance, and viscosity stability to help extend engine life and maintain peak performance.
Key Features
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Genuine Mercury Marine OEM 4-stroke engine oil
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SAE 10W-30 viscosity grade
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Provides outstanding wear and corrosion protection
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Maintains viscosity under extreme heat and high engine loads
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FC-W and FC-W Catalyst Compatible certified
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Designed specifically for marine engine operating conditions
Part Details
OEM Part Number: 8M0078638
Mercury Reference Number: 92-8M0078638
Product Type: 4-stroke marine engine oil
Oil Type: Marine engine oil formulation
Viscosity: SAE 10W-30
Container Size: 4 Liters (approx. 1 gallon)
Compatible Mercury & MerCruiser Engines
Approved for use in most 4-stroke marine engines requiring SAE 10W-30 oil, including:
Mercury FourStroke Outboards
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Mercury 2.5HP – 150HP FourStroke outboards
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Mercury 75HP – 150HP EFI FourStroke
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Mercury Pro XS FourStroke models
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Mercury 3.4L V6 FourStroke outboards
MerCruiser Sterndrives & Inboards
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MerCruiser 3.0L
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MerCruiser 4.3L V6
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MerCruiser 5.0L V8
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MerCruiser 5.7L V8
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MerCruiser 6.2L V8
This oil can also be used in other marine engines that specify 10W-30 marine-rated oil.
Function
Marine engine oil lubricates internal engine components such as pistons, crankshafts, and bearings while helping regulate temperature and reduce friction.
Using Mercury marine oil helps:
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Reduce internal engine wear
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Prevent corrosion caused by moisture and saltwater exposure
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Maintain engine cleanliness and lubrication
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Protect engines operating at high RPM and heavy loads
Important Compatibility Note
Always verify the recommended oil viscosity in your engine owner’s manual. Some Mercury engines require 25W-40 or other marine-specific oils depending on model and operating conditions.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.