Red Line Oil MT-90 / 75W90 GL-4 gear oil<p>MT-90 Gear Oil</p> <ul> <li>75W90 GL-4 gear oil (similar to SAE 5W40/10W40 engine oil viscosity)</li> <li>Popular in Nissan, Mazda, Mitsubishi, VW/Audi, Lotus Elise/Exige, Toyota</li> <li>Offers quicker shifts, perfect synchronizer coefficient of friction</li> <li>Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage</li> <li>High performance gear protection and longer synchro life</li> <li>Eliminates notchy shifting, even when cold</li> <li>Satisifies the gear oil viscosity requirements of 75W, 80W and motor oil viscosities of SAE 40, 10W40, and 15W40</li> <li>Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified</li> </ul>