Sierra Part # 18-9540-3 Full Synthetic Blend Engine Oil, 1 Gallon Sierra TC-W3 2-Cycle

Sierra Full Synthetic TC-W3 2-Stroke Outboard Oil – 1 Gallon Jug (Part # 18-9540-3)

The ultimate 2-stroke protection for modern high-performance outboards and personal watercraft. Sierra Full Synthetic TC-W3 is a 100 % synthetic formulation that goes beyond the Premium Blend (18-9500-3) to deliver maximum film strength, extreme-temperature stability, and the cleanest burn possible.

NMMA® TC-W3® certified and warranty-safe for every 2-cycle marine engine (Mercury, Yamaha, Evinrude/Johnson, Suzuki, Honda, Tohatsu, Nissan, and more). Perfect for oil-injection systems or pre-mix — will NOT void your engine manufacturer’s warranty.

Why choose Sierra Full Synthetic over premium/synthetic blends: • True 100 % full-synthetic base stocks for superior wear protection and thermal stability • Virtually eliminates ring sticking, carbon deposits, piston scuffing, and exhaust-port blockage • Lowest aquatic toxicity in the industry — far cleaner for fish and marine life • Exceptional performance with ethanol fuels and in extreme heat/high-RPM operation • Keeps power valves, spark plugs, and combustion chambers spotless for maximum horsepower • Exceeds JASO, ISO, API, and all current NMMA TC-W3 standards • Reduced smoke and cleaner combustion even under wide-open-throttle conditions

One gallon (128 fl oz / 3.78 L) jug — the top-tier choice for tournament anglers, performance boats, and anyone who demands the absolute best lubrication money can buy.

Sierra has been the marine industry’s leading aftermarket supplier for over 50 years, engineering products that meet or exceed OEM standards. Get dealer-level (or better) full-synthetic protection without the dealer price tag.

Give your high-horsepower 2-stroke the cleanest, strongest, longest-lasting oil available — Sierra Full Synthetic TC-W3.