Motorex 1L 5W40 4T Boxer Synthetic Engine Oil Known as the oil of Switzerland, Motorex has been lubricating motorcycle engines and components for 100 years. 2017 saw the celebration of 100 years of Motorex, and there's no doubting the strong reputation associated with the Motorex brand name. Trusted by factory race teams worldwide, Motorex products range from air filters to chain lube, brake fluid and oils. Market-leading performance, an unmatched range of every product you could ever need Synthetic high-performance engine oil, specifically for use in 4-stroke boxer engines. Guarantees a stable lubricating film and a constantly high oil pressure under all operating conditions and lowers the friction in the engine significantly.