* Red Line MT90 is a 75W90 GL-4 gear oil (similar to SAE 5W40/10W40 engine oil viscosity) * Popular in Nissan, Mazda, Mitsubishi, VW/Audi, Lotus Elise/Exige, Toyota * Offers quicker shifts, perfect synchronizer coefficient of friction * Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage * High performance gear protection and longer synchro life * Eliminates notchy shifting, even when cold * Satisifies the gear oil viscosity requirements of 75W, 80W and motor oil viscosities of SAE 40, 10W40, and 15W40 * Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified