Bel-Ray 99730-BT4-4PK Marine 4-Stroke 25W-40 Mineral Engine Oil - 4 Liter Bottle, (Case of 4) 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