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⚙️ Shift smarter, not harder — unlock the smoothest drive of your life!
Red Line 50304 MT-90 is a premium synthetic 75W-90 GL-4 manual transmission and transaxle lubricant designed to enhance gear protection, extend synchro life, and deliver smoother, quieter shifts. Its unique formula is safe for brass synchros, eliminates notchy shifting even in cold conditions, and withstands high heat and load, making it the go-to choice for performance-minded drivers seeking reliable, long-lasting transmission care.
| ASIN | B003P550IE |
| Best Sellers Rank | #14,589 in Automotive ( See Top 100 in Automotive ) #37 in Gear Oils |
| Brand | Red Line Oil |
| Brand Name | Red Line Oil |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 423 Reviews |
| Item Form | Fluids,Oil |
| Liquid Volume | 128 Fluid Ounces |
| Manufacturer | Red Line |
| Material | Synthetic |
| Model Number | 50304 |
| Number of Items | 4 |
| Package Information | Bottle |
| Part Number | 50304 |
| Recommended Uses For Product | Gear Oil |
| SAE J300 Viscosity Grade | 75W-90 |
| Specific Uses For Product | Manual transmissions and transaxles, particularly in vehicles from Nissan, Toyota, and Mazda, and in conditions that require gear protection, smooth shifting, and longer synchro life. |
| UPC | 737534816608 |
| Unit Count | 128.0 Fluid Ounces |
| Viscosity | 75W90 |
F**E
Smooth Shifting and Quiet Operation—Worth the Upgrade
Red Line MT-90 is a top-tier synthetic gear oil that delivers noticeable improvements in manual transmission performance. I used it in a high-mileage 5-speed and immediately felt smoother shifts—especially in cold weather. It quieted down some minor gear whine and made engagement feel more precise. The GL-4 rating is perfect for transmissions that need protection without the aggressive additives found in GL-5 oils, which can be harsh on yellow metals like synchros. The viscosity is ideal for most import and domestic gearboxes that spec 75W-90, and it holds up well under heat and load. If you're chasing better shift feel or just want to treat your transmission right, MT-90 is a solid investment. It’s not the cheapest option, but the performance and protection are worth every drop.
U**N
Quality fluid, worthy investment.
Quality, helps shifting, protects transmission, reduces noise, easy to pour in and its lubricity and greasiness is perfect for older and newer vehicles. Lasts longer than stock fluids too
C**O
Favorite choice for GL-4. Worth the extra cost.
Noticeably better shifts. Synchro engagement feels much smoother.
E**E
2005 4.0 V6 6 Speed MT Tacoma
I put this in my 2005 4.0 V6 6 Speed MT tacoma and it removed the small grinds going into gears. Definitely worth the extra money!
R**C
Excellent synthetic manual transmission gear oil
Excellent manual transmission gear oil We notice easier the Toyota Tacoma is much easier to shift gears in cold weather. Previous brand oil required much slower shifting with considerable resistance on cold morning below 40 degrees. GL4 is much safer to use in transmission with brass parts than GL5 because GL5 additives are often chemically reactive with brass causing unnecessary wear.
K**E
Good price and quality product
Transmission shifts like butter now
T**Y
Works as described
Works as described
T**D
31-year-old jeep
1995 Jeep YJ, the old shifts like butter..
H**Y
Smooth shifting
Shifts very smooth in my 2009 mazdaspeed 3
P**N
94 shifting nicely again
1994 Eurovan 5 speed shifting as it should again. Shipping speed wss good. Packaging was good. It was bit pricey but there are cheaper alternatives. You get what you pay for.
J**.
Prompt shipping
I used it for a classic car manual transmission.
A**R
Awesome stuff
Great product
M**L
Good product
Would be five stars but took way too long to get to me.
Trustpilot
1 month ago
3 weeks ago