Mirr Outboard 2T TC-W3 is a ultra premium quality Two cycle, Water Cooled, type 3 formula ashless lubricant designed to meet the most critical requirement of all air cooled and water cooled outboard engines. It is certified to use in separate oil tanks like Variable Ratio Oil injection motors (VRO). Formula 3 also has decarbonizing additives formulated to be more compatible with the newer non-leaded fuel. We recommend fuel/oil-mixing ratios of 50:1 or as per manufacture?s recommendation.