Helping improve safety and operations of large equipment in such industries as railroads, airlines, and mining, new ASTM standard provides test method to determine amount of fuel present in an in-service lubricant line. Test Method for Fuel Dilution of In-Service Lubricants Using Surface Acoustic Wave Sensing (D8004), as first standard of its kind to guide this approach, will enable those who use it to provide advisories on equipment if it is suspect and take early action.