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⚙️ Shift smoother, drive smarter — never settle for less than Red Line MT-90!
Red Line MT-90 Gear Oil is a premium synthetic 75W-90 lubricant designed specifically for manual transmissions and transaxles. Its GL-4 rating and optimized friction coefficient ensure smooth, precise shifting while protecting synchronizers from wear. With outstanding shear and oxidation stability, it maintains consistent viscosity under varying temperatures and heavy loads, making it a top choice for performance and longevity in both domestic and import gearboxes.
| ASIN | B003P550IE |
| Brand | Red Line |
| Brand Name | Red Line |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 405 Reviews |
| Item Form | Oil |
| Item form | Oil |
| Liquid Volume | 128 Fluid Ounces |
| Liquid volume | 128 Fluid Ounces |
| Manufacturer | Red Line |
| Material | Synthetic |
| Model Number | 50304 |
| Package information | Bottle |
| Part Number | 50304 |
| Recommended Uses For Product | Gear Oil |
| Recommended uses for product | Gear Oil |
| UPC | 737534816608 |
| Unit Count | 128.0 Fluid Ounces |
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.
H**Y
Smooth shifting
Shifts very smooth in my 2009 mazdaspeed 3
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
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.
Trustpilot
1 month ago
1 month ago