Best Red Line in 2026

Designed for the latest Big-Twin motorcycle engines that specify 20W50 motor oil, including Milwaukee-Eight, Evolution, Twin Cam and aftermarket engines of similar design

Superior film strength through the use of ester base stocks for protection and ring seal

Extended drain intervals over other brands due to higher quality base stocks and excellent dispersants

HIGH PERFORMANCE - Gear protection and longer synchro life. Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified

OFFERS QUICKER SHIFTS - Excellent gear and synchro protection, balanced friction control & slipperiness for easier shifting even in cold climates

SAFE FOR BRASS SYNCHROS - GL-4 Gear Oil lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications

This product dampens transmission noise (reducing the notorious shifting clunk found in these gearboxes), dramatically reduces temperature, provides thicker oil films between gear teeth and resists throw-off

Compatible with all aftermarket versions like Baker, JIMS, S&S, etc.

Compatible with all HD trans including with Milwaukee-Eight engines, Evolution engines, Twin Cam engines and latest 6-speed Cruise Drive

CUTTING EDGE TECHNOLOGY - Shockproof technology designed to make a big impact against big impacts

QUIET SMOOTH SHIFTING - V-Twin Transmission oil dampens transmission noise, reducing the notorious shifting clunk found in these gearboxes

IMPROVES PERFORMANCE - Transmission fluid that dramatically reduces temperature, providing thicker oil films between gear teeth and resists throw-off

Red Line 50304 Manual Transmission (MT) 90W Gear Oil

Item Package Dimension 8.49999999133L x 3.99999999592W x 3.99999999592H inches

Item Package Weight - 1.69976404002 Pounds

Item Package Quantity - 1

Better protection

Improved performance

Quality you can trust

For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.

Designed for the latest Big-Twin motorcycle engines that specify 20W50 motor oil, including Milwaukee-Eight, Evolution, Twin Cam and aftermarket engines of similar design

Superior film strength through the use of ester base stocks for protection and ring seal

Extended drain intervals over other brands due to higher quality base stocks and excellent dispersants

LONGER SYNCHRO LIFE - High-performance gear protection, satisfies the gear oil viscosity requirements of 75W, 80W and motor oil viscosities of SAE 30, 10W30, 5W31

OFFERS QUICKER SHIFTS - MLT Gear Oil with balanced friction control for most manual transmission synchronizers. Other synthetic gear oils are often too slippery

SAFE FOR BRASS SYNCHROS - As it lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications

Item Package Dimension: 8.81L x 4.05W x 4.05H inches

Item Package Weight - 1.75 Pounds

Item Package Quantity - 1

Popular for performance engines in high-temperature climates

Popular for 5.4L Supercharged Ford applications like Shelby GT 500 and Ford GT, Focus RS (WSS-M2C931-B/-C)

Recommended for use in 2001-2002 Range Rover engines

Recommended for small cars, hybrids and some trucks like Honda Insight and Civic Hybrids, Toyota Solara, Camry, Rav4, Tundra 5.7L and Venza

Lightest passenger car motor oil available from Red Line

Increased fuel economy and improved wear at cold start

Most popular oil for modern road cars and light trucks, as specified for most late-model BMW, General Motors and Nissan vehicles

Suitable for VW/Audi 502.00/503.01/505.01-99, BMW LL-01 and Ford WSS-M2C946-A

Thicker oil film at operating temperature than a petroleum 10W40

Prepares potential wear surface and prevents metal contact before adequate lubrication can be supplied

Unlike other assembly lubes, Red Line's will not plug filters after initial engine start-up

Provides 3x greater film strength than conventional black Molybdenum Disulfide greases

LONGER SYNCHRO LIFE - High-performance gear protection, satisfies the gear oil viscosity requirements of 75W, 80W and motor oil viscosities of SAE 30, 10W30, 5W30

OFFERS QUICKER SHIFTS - MLT Gear Oil with balanced friction control for most manual transmission synchronizers. Other synthetic gear oils are often too slippery

SAFE FOR BRASS SYNCHROS - As it lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications

This 75W85 GL-4 gear oil is designed to fill the viscosity gap between MTL (70W80 GL-4) and MT-90 (75W90 GL-4), making it a perfect fit Compatible with many Nissan, Mitsubishi, Hyundai, Kia and NV4500 pickup truck transmission Compatible with.

Complete kit for motorcycles equipped with Evolution, Milwaukee-Eight and Twin-Cam engines*

2007-up H-D motorcycle with the 96-inch and larger Twin Cam engines, users must purchase one extra bottle of Primary Chain Case Oil to meet this engine’s 38 oz (45 oz dry) capacity, compared to the 32 oz wet capacity of a Milwaukee-Eight, Evolution or V-Twin case

Includes 5 quarts of 20W50 Motorcycle Oil, 1 quart of V-Twin Transmission Oil with ShockProof, 1 quart of Primary Chain Case Oil, 1 bottle of Fuel Injection Cleaner for Powersports, a sticker kit, a Red Line Oil embroidered hat and a versatile funnel

Our most versatile ATF, for use in automatic, manual transmissions and power steering

Popular applications: Toyota Type T-III and T-IV, Honda ATF-Z1, Nissan Matic D, J & K, Diamond SP-II, SP-III, Mazda ATF M-V, most BMW and Audi/VW automatic transmissions

Also used with manual transmissions and transaxles like T-5, T-45, T-56 and late-model BMW, provides a GL-4 level of gear protection

HIGH PERFORMANCE - Gear protection and longer synchro life. Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified

OFFERS QUICKER SHIFTS - Excellent gear and synchro protection, balanced friction control & slipperiness for easier shifting even in cold climates

SAFE FOR BRASS SYNCHROS - GL-4 Gear Oil lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications

Suitable replacement for the following products: Dexron II, III and Dexron IIIH

Most versatile ATF, use where Dexron III, Dexron II, Mercon and Mercon V fluids are recommended, provides a GL-4 level of gear protection

Also used with manual transmissions and transaxles like T-5, T-45, T-56 and late-model BMW

PRIMARY CASE OIL - For 1984-to-present V-Twin American motorcycle engines, including Evolution, Twin Cam, and aftermarket engines of similar design

BOOSTS VEHICLE PERFORMANCE - Improves clutch operation while reducing wear and temperature, providing a longer clutch lifespan

PERFORM & PROTECT - This product is for use in the primary chaincase with wet-diaphragm spring clutches. Perfect for Motorcycles, ATVs, and Powersports

Our most versatile ATF, for use in automatic, manual transmissions and power steering

Popular applications: Toyota Type T-III and T-IV, Honda ATF-Z1, Nissan Matic D, J & K, Diamond SP-II, SP-III, Mazda ATF M-V, most BMW and Audi/VW automatic transmissions

Also used with manual transmissions and transaxles like T-5, T-45, T-56 and late-model BMW, provides a GL-4 level of gear protection

HIGH PERFORMANCE - Gear protection and longer synchro life. Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified

OFFERS QUICKER SHIFTS - Excellent gear and synchro protection, balanced friction control & slipperiness for easier shifting even in cold climates

SAFE FOR BRASS SYNCHROS - GL-4 Gear Oil lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications

Our most versatile ATF, for use in automatic, manual transmissions and power steering

Popular applications: Toyota Type T-III and T-IV, Honda ATF-Z1, Nissan Matic D, J & K, Diamond SP-II, SP-III, Mazda ATF M-V, most BMW and Audi/VW automatic transmissions

Also used with manual transmissions and transaxles like T-5, T-45, T-56 and late-model BMW, provides a GL-4 level of gear protection

Greatest extreme-pressure protection with the lowest co-efficiency of friction available

Reduces temperatures dramatically

Provide gear teeth shock loading protection as well as giving a thicker oil films between gear teeth

Compatible with/in many late model BMW, Dodge, Ford, GM, Jeep, Lexus, Mercedes-Benz, Ram, Toyota

Applications include differential oil, final drive oil, gear oil and transfer case fluid

Contains additional friction modifiers for suitability with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required

All-weather viscosity grade for passenger cars and light trucks

Popular in crate engines and high-performance V-8 engines

Thicker oil film at operating temperature than a petroleum 10W40

Greatest extreme-pressure protection with the lowest coefficiency of friction available.

Provide gear teeth shock loading protection as well as giving a thicker oil films between gear teeth

Reduces temperatures dramatically