Sierra 94203 10W-30 FCW 4-Stroke Outboard Oil — 1 Gal
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Gallon-Size 4-Stroke Marine Engine Oil for High-Volume Service
Sierra 94203 is the gallon format of Sierra's NMMA FC-W® Certified 10W-30 4-stroke outboard oil. Formulated specifically for marine 4-stroke engines, it meets or exceeds the performance requirements of Mercury, Yamaha, Johnson-Evinrude, Suzuki, and Honda — and satisfies API SJ, CF-2, and CH-4 standards.
The gallon size is the practical choice for shops, marinas, and boat owners who perform multiple oil changes per season or service more than one engine.
Key Benefits
- NMMA FC-W® Certified — meets API SJ, CF-2, and CH-4 performance standards
- Excellent anti-wear protection for high-RPM marine engine components
- Maximum corrosion resistance for saltwater and freshwater environments
- Reduces sludge buildup, keeping the engine cleaner for sustained efficiency
- Low-temperature viscosity for reliable cold-weather starting
Also Available
- Sierra 94202 10W-30 FCW 4-Stroke Outboard Oil — 1 Qt — single-quart option for occasional use or topping off
- Sierra 9394 Oil Change Kit — complete kit with oil, filter, gasket, funnel, maintenance sticker, and shop towel
Parts Desk Insights
The gallon format is the preferred buy for customers servicing multiple engines or running a busy seasonal schedule. Best use case: marinas, mobile marine technicians, and serious DIYers who do two or more oil changes per season and want to avoid running out mid-service. Pointing customers toward the Sierra 9394 Oil Change Kit alongside this product covers the filter and gasket in one transaction — a natural add-on that reduces callbacks.
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.