ercury Premium Plus 2-Stroke TC-W3 Outboard Oil (3.78L) is engineered for superior lubrication and reduced carbon buildup in both oil-injected and pre-mix Mercury and Mariner two-stroke outboards. Designed for higher-output, high-load marine environments, this formulation minimizes wear, smoke, and spark-plug fouling while improving overall engine cleanliness. Suitable for select 2-cycle models requiring TC-W3-certified oil, it delivers consistent protection for older carbureted engines, classic pre-mix models, and modern oil-injection systems found across the Mercury 2-Stroke family.
This oil is ideal for engines operating under demanding conditions such as offshore fishing, towing, or extended wide-open-throttle use. For pre-mix applications, Mercury Premium Plus supports common ratios such as 50:1, 40:1, and 25:1, depending on engine design and manufacturer recommendations. Whether used in portable two-strokes, mid-range outboards, or classic V6 models, it helps maintain cleaner combustion and reliable long-term performance.
Most Mercury and Mariner 2 stroke engines from the mid 1980s onwards use oil injection or if they require pre-mix fuel use 50:1. Always check the owner's manual for accurate details prior to use.