Fleetguard Inc. has released Fleet-tech, a new diesel fuel additive package that provides advanced fuel system protection for heavy-duty vehicles during harsh weather conditions. Fleet-tech is available in four formulations designed for specific application use: Winter Conditioner; Winter Conditioner Concentrate; Asphaltene Conditioner; and Asphaltene Conditioner Concentrate. Fleet-tech comes in several packaging options for end user convenience: quart, 2.5-gallon, 5-gallon and 55-gallon drum.