Keeping your big diesel truck lubricated is crucial for ensuring that your truck stays running at its very best, and high-quality oils and lubricants are key. Motul manufactures high-quality fluids, oils, and lubricants that will keep your motor, transmission, and braking system working at their very best so that your tough diesel truck won't let you down during even the most aggressive applications. Motul's motor oil, gear oil, brake fluid, or transmission fluid are made to the highest standards and will give your diesel truck the reliability it needs to stay running for years to come.