Sierra 95403 Fully Synthetic TC-W3 2-Stroke Marine Engine Oil – 1 Gal.
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Sierra 95403 Fully Synthetic TC-W3 2-Stroke Marine Engine Oil – 1 Gal.
A fully synthetic TC-W3 rated 2-stroke outboard oil engineered for high-performance and high-horsepower applications. Sierra’s 95403 exceeds the requirements of NMMA TC-W3, JASO, ISO, and API standards, making it compatible with virtually all 2-stroke outboard engines — including modern direct-injection systems. The fully synthetic base provides cleaner combustion, reduced carbon deposits, and superior protection across a wide operating range compared to conventional or semi-synthetic alternatives.
Suitable for both oil injection systems and pre-mix applications, this oil is formulated to minimize ring sticking, exhaust port blockage, and deposit buildup — common failure points in high-output 2-stroke engines running hard in demanding conditions.
Specifications
- Part Number: 95403
- Type: Fully synthetic
- Rating: TC-W3 / JASO / ISO / API
- Engine type: 2-stroke outboard
- Application: Oil injection systems and pre-mix
- Volume: 1 US gallon (~3.8 L)
- Weight: 3.5 kg (7.7 lb)
Parts Desk Insights
Best use case: The 95403 is the right choice for boaters running high-horsepower 2-stroke outboards — particularly direct-injection engines (such as E-TEC or FICHT) that demand a fully synthetic formulation for optimal cleanliness and protection. The gallon format suits boaters who go through oil regularly and want to minimize per-litre cost without stepping up to drum quantities. For occasional use, top-ups, or smaller engines, the Sierra 95402 Fully Synthetic TC-W3 2-Stroke Oil – Quart is the more practical size. Always verify your engine manufacturer’s oil specification before switching oil types.
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.