Bel-Ray 99730-BT1-12PK Marine 4-Stroke Mineral Engine Oil 25W-40 - 1 Liter Bottle, (Case of 12) Premium engine oil specially engineered for the harsh operating conditions of the marine environment Combines the highest quality mineral base fluids with the latest technology of marine 4-stroke additives Provides super protection against wear, rust, corrosion and deposits Exceeds the performance requirements of the new NMMA FC-W Catalyst Compatible standard for marine 4-stroke engine oils