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  • Regular price $50.22
Tax included.

  • Popular in Nissan, Mazda, Mitsubishi, VW/Audi, Lotus Elise/Exige, Toyota, Mendeola transmissions and Atlas transfer cases for Off Road
  • 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.
Product Details

Since most GL-5 gear oils for differentials are too slippery for manual transmissions, Red Line offers these products that ensure proper shifting while providing ultimate wear protection

  • Appropriate coefficient of friction for most manual transmission synchronizers (other's synthetic gear oils are often too slippery for proper synchro engagement)
  • Red Line offers lubricants to pinpoint nearly every transmission application
  • MTL, MT-85 & MT-90 are not for use in differentials with hypoid gears
  • Excellent gear and synchro protection, balanced slipperiness for easier shifting in cold climates
  • Excellent for high- and low-mile transmissions
  • Compatible with petroleums and other synthetics.


API Service Class GL 4
SAE Viscosity Grade (Gear Oil) 75W90
SAE Viscosity Grade (Motor Oil) 15W40
Vis @ 100°C, CSt 15.5
Vis @ 40°C, CSt 86
Viscosity Index 194
Pour Point, °C -45
Pour Point, °F -49
Brookfield Viscosity @ -40°C, Poise 320
Quart 50304
Gallon 50305
5 Gallon* 50306
16 Gallon* 50307
55 Gallon* 50308

*Only available from our dealers


oem compatibility

RED LINE MT-90 HIGH-PERFORMANCE GEAR OIL is a full-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.

Suitable replacement for:

API GL-4/GL-3/GL-1
SAE 75W90 SAE 90/80W90
SAE 40/10W40/15W40

Alfa Romeo
Audi G 052 911
BMW  81 22 9 407 305
Castrol  BOT 130M
Castrol  BOT 328
Castrol  SAF AG4
Castrol  SHC 630 
Castrol  TAF-X 75w-90
Castrol  Syntrans Transaxle 75W-90
Ford  F32Z-19C547-MA
Ford  M2C175-A 
Ford  M2C200-B 
Ford  WSS-M2C203-A1
Ford  XT-4-QGL
GM  12345371
GM  12345724
GM  12345871
GM  12346074
GM  89021806
GM  89021807
GM-Daewoo  EDS-M-8049
Hyundai/Kia  08950-00010-A
Jeep  0489722AA
Mazda  (MES) 115A
Nissan  Mission Oil MP-G HQ
Toyota  08885-80917
Toyota  08885-81023
Toyota  08885-81026
VW/Audi  G 005 000  
VW/Audi  G 005 100 
VW/Audi  G 045 190 A2
VW/Audi  G 052 145 
VW/Audi  G 052 157 
VW/Audi  G 052 911
VW/Audi  G51
VW/Audi  G50