Nulon X-Pro performance engine oils feature Advanced Additive Technology (AAT). From the moment you start your engine, Nulon X-Pro delivers outstanding performance and protection against heat and wear in every type of driving condition.Nulon X-Pro 15W-40 Hi-Torque Performance engine oil is a premium diesel engine oil specially developed for vehicles with extended service intervals, exhaust aftertreatment and turbocharging. X-Pro 15W-40 Hi-Torque Performance meets the stringent emission performance requirements of many modern Original Equipment Manufacturers (OEMs).