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⚙️ Shift Smooth, Protect Hard: The Ultimate Gear Oil Upgrade
Red Line 50304 MT-90 is a premium synthetic 75W-90 GL-4 manual transmission and transaxle lubricant designed to deliver smoother shifts, longer synchro life, and superior gear protection. Its unique formula eliminates notchy shifting even in cold weather and is safe for brass synchros, avoiding the corrosive effects common in GL-5 oils. Trusted since 1979, this 4-pack quart set is perfect for a wide range of vehicles requiring high-performance gear oil that stands up to heat and heavy loads.
| ASIN | B003P550IE |
| Best Sellers Rank | #18,167 in Automotive ( See Top 100 in Automotive ) #36 in Gear Oils |
| Brand | Red Line Oil |
| Date First Available | June 2, 2010 |
| Is Discontinued By Manufacturer | No |
| Item Form | Fluids,Oil |
| Item Weight | 1.98 pounds |
| Item model number | 50304 |
| Liquid Volume | 128 Fluid Ounces |
| Manufacturer | Red Line |
| Material | Synthetic |
| Number of Items | 4 |
| Package Information | Bottle |
| Product Dimensions | 16 x 4 x 9 inches |
| 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.
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.
J**K
good!
damn good stuff!!!! but a little pricey.
T**P
Shake the bottle towards the end.
This stuff went into my 2005 Pontiac Vibe. It took 2 quarts and at the end I noticed there was some 'sludge' at the bottom of both jugs. this is GOOD sludge BTW so i took an ounce of old fluid (wasn't that old) to give it something to shake around with. I think it's the esters that sat on the shelf for months that settled. Anyways. get it all out of the bottle and you will be good. This MT-90 fluid made my car shift much better too.
K**E
Good price and quality product
Transmission shifts like butter now
D**S
👍
Packaged ell and was what I needed
S**D
Yummy shifting.
Works great for toyota yaris. Car has brass synchros which do better with GL4 formulation than the newer GL5 products.
T**A
As described.
As described.
H**Y
Shifts very smooth in my 2009 mazdaspeed 3
P**N
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**.
I used it for a classic car manual transmission.
A**R
Great product
M**L
Would be five stars but took way too long to get to me.
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