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⚙️ Shift smarter, drive smoother — the ultimate gear oil upgrade!
Red Line 50304 MT-90 is a premium 75W-90 GL-4 manual transmission lubricant designed to protect gears and extend synchronizer life. Its unique friction formula ensures quicker, smoother shifts even in cold conditions, while being safe for brass synchros by avoiding harmful reactive sulfurs. Trusted since 1979, this 4-pack offers professional-grade performance for GL-1, GL-3, and GL-4 applications, making it the go-to choice for discerning drivers who demand reliability and longevity from their vehicle fluids.
| ASIN | B000QFN326 |
| Best Sellers Rank | #285,729 in Automotive ( See Top 100 in Automotive ) #221 in Gear Oils |
| Brand | Red Line |
| Brand Name | Red Line |
| Compatible Material | Brass |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 77 Reviews |
| Included Components | (1063017) MT-90 75W90 GL-4 - QUART |
| Item Form | Oil |
| Item Type Name | ENGINE OIL |
| Item Weight | 2 pounds |
| Liquid Volume | 128 fluid ounces |
| Manufacturer | Red Line |
| Model Number | 50304 |
| Number of Items | 4 |
| Number of Packs | 4 |
| Package Information | Bottle |
| Part Number | 50304 |
| Recommended Uses For Product | Automotive |
| SAE J300 Viscosity Grade | 75W-90 |
| Unit Count | 128 Fluid Ounces |
| Viscosity | 75W-90 |
| Warranty Description | LIMITED WARRANTY |
A**X
Best Fluid For Your Vehicle 🚗
Great price for a great product, got some for my 2006 Toyota Tacoma TRD Sport Manual transmission, Red Line is one of the best fluids you can get for your vehicles, just make sure you get the right GL formula for what you need it, I had to use some GL-4 and GL-5 for other components, I change all my fluids, my rear differential, transfer case, transmission, front differential with Red Line fluids only.
W**E
Very good
Works good.
J**N
Smother shifting
Seems to have made my shifting smoother, 1st gear is still tricky but I do not believe that’s from MT-90… 1999 Jeep Wrangler Sport 4.0L 5 speed
R**Z
Good price
Good price and shipped in perfect condition
C**R
A lot better so far.
The first time changing my transmission fluid in my AX-5 for my jeep TJ. The nozzle on the bottle is not a standard size according to the Slippery Pete fluid pump (28mm was too big but still works just fine). After doing the first bottle there was a thick residue at the bottom. I might be oblivious and didn't see a shake well sign but you probably want to shake it to make use you get everything into the transmission.
D**Y
I only use red line gear oils
Does great. The manual trans is quieter and shift’s better
C**Y
Keep TJ AX15 application
What to put in a Jeep TJ transmission has been an argument since GL3 went off the market. This product is more expensive than 10w30, or GL5 75 weight. However, in my case it worked materially better than anything else I have tried. If you are comfortable paying for quality, this is the jeep TJ transmission oil to buy.
C**.
Oil change 2915 Smart Car Trans
EXACTLY EHST OEM 2015 SMART CAR REQUIRES FOR TRANSMISSION OIL CHANGE. Works as it should. Highly Recommended. My transmission shifts much better. It took 3 quarts.
Trustpilot
1 month ago
5 days ago