NOMEX NOBO CHALLENGER Motorcycle Oil is a high performance engine oil for 4 stroke 2 & 3 wheelers. This oil is a high viscosity index, 4 stroke engine oil. NOMEX NOBO CHALLENGER Motorcycle Oil is a high performance conventional four-stroke motorcycle engine oil and is primarily intended for general use in all types of four-stroke motorcycles and engines. NOMEX NOBO CHALLENGER Motorcycle Oil 20W50 and NOMEX NOBO CHALLENGER Motorcycle Oil 10W40 combine highly refined, quality mineral oils and an advanced additive system to provide good engine cleanliness, good wear protection and corrosion protection.