Premium mineral formula: approved for pre-mix and oil injection systems, tc-w3 certified: detergency that exceeds tc-w3 minimums to minimize carbon and deposits and protect against corrosion in the challenging marine environment boats face mixes easily with fuel, can be used in premix or oil injection systems specifications: mineral based, tc-w3 certified 2-stroke engine oil. tc-w3, api tc, jaso fb application: use wherever a tc-w3 certified 2-cycle outboard engine oil is specified
