Red Line MT-90 GL-4 Gear Oil

Red Line MT-90 GL-4 Manual Transmission Gear Oil

RED LINE MT-90 HIGH-PERFORMANCE GEAR OIL is a fully-synthetic ester-based lubricant designed for use in manual transmissions and front-wheel-drive transaxles. This shear-stable formula resists breakdown for extended periods and offers more consistent viscosity in warm and cold temperatures for less gear noise and improved shifting. This fluid is less slippery for improved synchronizer coefficient of friction and offers stronger film strength for better wear protection.

Key benefits:

• 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
• Satisfies the gear oil viscosity requirements of 75W90, 80W90, 90 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

Red Line are an American company and their products come in US Quart or US Gallon sizes. Use our handy guide to find out how many bottles you need for your application.

US Quarts	Litres
1 US Quart	0.946
2 US Quarts	1.892
3 US Quarts	2.838
4 US Quarts	3.784
US Gallons	Litres
1 US Gallon	3.784
2 US Gallons	7.568

Red Line makes gear oils for specific applications, not one type to satisfy most fairly well.

Their GL-5 differential lubricants contain friction modifiers and reducers to lubricate limited-slip clutches properly and reduce friction of the ring and pinion. Non Slip or "NS" gear oils are designed for transmission use where synchronizers need the proper friction to synchronize gear shifts.

The “MT” series is designed for synchronized gearshift applications where lower sulfur levels are desired.

All formulas have a high viscosity index to deliver relatively constant viscosity with temperature change. Synthetic polyol ester base stocks deliver excellent lubrication under extreme conditions, superior shear and oxidation stability, as well as natural multigrade properties, eliminating the need for unstable thickeners.

Red Line gear and transmission oils are recommended for passenger car, commercial and racing applications.