VP Racing CI1 Hi-Performance diesel engine oil is formulated with outstanding high-viscosity index synthetic base oils. This provides excellent high and low-temperature protection for high performance diesel race engines. The lubricant includes high levels of ZDDP and an aggressive detergent dispersant and anti-oxidant package to protect oil thickening and engine deposits. VP Racing compression ignition oil is recommended for many high performance diesel race engines, as well as tow vehicles.