Mercury – Quicksilver Oil Tank Reservoir Cap Assembly | Lubrication System Component | Complete OEM Assembly | 43300A9 Overview Your 2-stroke outboard depends on consistent oil flow to stay protected, and the Mercury Marine 43300A9 Quicksilver Oil Tank Reservoir Cap Assembly keeps that system working the way it should. Designed for Mercury and Mariner 135–250HP TwoStroke outboards, this complete assembly includes the cap, float, sender, and wiring harness. It monitors oil level and ensures your engine always has the lubrication it needs, so you can focus on the water instead of worrying about oil supply. Built to Mercury’s factory standards, it’s reliable, precise, and ready to install. Key Features Purpose: Replaces the entire oil reservoir cap assembly to restore proper oil monitoring and flow. Includes: Cap, float, oil level sender, and wiring harness — all factory-matched components. Performance: Sends accurate oil-level readings to your warning system for dependable alerts. Material: Made with marine-grade plastics and sealed electronics to resist heat, oil, and vibration. Durability: Built for long life in demanding 2-stroke environments. Engine & Boat Compatibility Mercury and Mariner 135–250HP TwoStroke outboards. Commonly found on bass boats, offshore fishing rigs, and sport cruisers. Safe for both freshwater and saltwater conditions. Direct replacement — installs easily with standard tools and plugs into existing wiring. Performance & Real-World Benefits The 43300A9 oil tank cap assembly keeps your oil system sealed and your warning system accurate. Its integrated float and sensor provide reliable feedback to your oil monitor, ensuring you always know when the tank needs refilling. A tight-fitting cap prevents dirt, water, or air from entering the reservoir, protecting your oil from contamination. With its rugged construction and pre-wired harness, installation is straightforward, and operation is trouble-free. Once in place, it quietly does its job — keeping your 2-stroke properly fed and protected every time you hit the throttle. Why Choose Mercury OEM The Quicksilver 43300A9 is a genuine Mercury Marine part, designed specifically for Mercury and Mariner 2-stroke oil systems. Aftermarket parts often lack proper calibration or sealing, which can lead to false warnings or oil leaks. Mercury’s OEM assemblies are built for the exact resistance and voltage range your system expects. Each unit is tested for accuracy, oil compatibility, and long-term durability. Choosing OEM ensures your oiling system performs just like the day your engine was built. FAQ Q1: What engines does this fit?It fits Mercury and Mariner 135–250HP TwoStroke outboards. Q2: What’s included in the assembly?You’ll get the cap, float, sender, and wiring harness — everything needed for a full replacement. Q3: Does it monitor oil level?Yes, it includes the level sender and float, which signal your engine’s oil warning system. Q4: How long does it last?With regular maintenance and clean oil, this OEM assembly provides years of reliable service. Q5: Why OEM instead of aftermarket?OEM guarantees exact fit, proper calibration, and long-term reliability under real marine conditions.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.
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