Mercury 10W-30 4-Stroke Synthetic Blend Marine Engine Oil – 1 Gallon | 8M0149213
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Mercury 10W-30 4-Stroke Synthetic Blend Marine Engine Oil – 1 Gallon
Part Number: 8M0149213
Brand: Mercury Marine
Official Product Type: Marine Engine Oil – SAE 10W-30 Synthetic Blend, 4-Stroke
Package Size: 1 US Gallon (3.785 L)
About This Oil
This is a genuine Mercury OEM synthetic blend 4-stroke marine engine oil engineered for high-temperature, high-RPM outboard operation. It delivers industry-leading viscosity retention under sustained load and uses advanced corrosion inhibitors to protect internal engine components from the harsh marine environment — salt, moisture, and heat cycles that land-based oils aren't built for.
Compatible Applications
- Mercury 3.4L V6 FourStroke outboards (150–200 HP)
- Mercury 4.6L V8 FourStroke outboards (200–300 HP)
- Mercury FourStroke outboards up to 150 HP where SAE 10W-30 is specified in the owner's manual
- Any Mercury 4-stroke outboard engine whose service manual calls for SAE 10W-30 marine engine oil
Always confirm the correct viscosity grade in your engine's owner's manual or service manual before ordering.
Serial Number / Fitment Note
Engine oil is selected by viscosity specification and engine family, not by serial number. If your engine's manual calls for SAE 10W-30 4-stroke marine oil, this product is the correct Mercury OEM choice. Serial number ranges do not apply to lubricant selection.
Service Interval
Replace engine oil and filter per Mercury's recommended service schedule — typically every 100 hours or annually, whichever comes first. Refer to your engine's service manual for the exact interval and capacity for your model.
Key Features
- Genuine Mercury OEM formulation — not an aftermarket substitute
- SAE 10W-30 synthetic blend for broad temperature range performance
- Engineered for high-RPM, high-output marine 4-stroke engines
- Advanced corrosion inhibitors protect against salt water and moisture
- Maintains viscosity under sustained wide-open-throttle operation
- Produced to Mercury Marine OEM specifications
Supersedes / Related Part Numbers
8M0149213 is the current Mercury-branded 1-gallon SKU for this 10W-30 synthetic blend oil. Related package formats (quart, case) carry different part numbers. No supersession data is currently published for this SKU.
Technical FAQ
Can I use automotive 10W-30 instead?
No. Automotive oils contain friction modifiers that can damage marine engine components and do not meet Mercury's corrosion-protection requirements for saltwater use. Always use a marine-rated oil.
Is this compatible with MerCruiser stern drives?
This oil is formulated for Mercury 4-stroke outboards. MerCruiser stern drives use a different oil specification — consult your MerCruiser service manual.
Can I mix this with other brands of 10W-30 marine oil?
Mercury recommends using their OEM oil exclusively. Mixing oils from different manufacturers is not recommended as additive packages may be incompatible.
Parts Desk Insights
Best use case: This is the go-to oil for customers performing routine annual or 100-hour service on Mercury V6 and V8 FourStroke outboards. It's also the correct choice for any Mercury 4-stroke where the manual specifies 10W-30 — a very common spec across the lineup.
Common mistakes: Customers sometimes order this for a MerCruiser stern drive or a 2-stroke outboard — neither application is correct. Also watch for customers ordering the quart size when they need a full gallon for a larger engine's oil capacity; confirm the engine's oil capacity before ordering quantity.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.