CRC Jump Start Starting Fluid with Lubricity ensures you are Ready for the Road Ahead , aiding your truck in fast, economical starts in cold or humid weather conditions. This heavy duty starting fluid boasts an upper cylinder lubricant to minimize engine damage during cold starts. To use, with engine turned off, spray once or twice in air intake system (air cleaner, carburetor, or intake manifold). Next, crank engine, if necessary, continue to spray application until engine is running smoothly. FleetPride is your First Click in Heavy Duty .