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โ๏ธ Shift smarter, drive smoother โ the proโs choice in transmission oil!
Red Line 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant is a premium synthetic gear oil designed to protect and extend the life of manual transmissions and transaxles. Its unique formula ensures quicker, smoother shifts by optimizing synchronizer friction and is safe for brass synchros by eliminating harmful reactive sulfurs. Compatible with GL-1, GL-3, and GL-4 applications, this 1-gallon bottle delivers trusted, high-performance lubrication backed by Red Lineโs legacy since 1979.






| ASIN | B002INX20C |
| Best Sellers Rank | #1,684 in Automotive ( See Top 100 in Automotive ) #4 in Gear Oils |
| Brand | Red Line |
| Brand Name | Red Line |
| Compatible Material | Brass |
| Container Type | Bottle |
| Customer Reviews | 4.9 out of 5 stars 5,095 Reviews |
| Global Trade Identification Number | 00083522503051 |
| Included Components | MT-90 75W-90 GL-4 |
| Item Form | Fluids,Liquid,Oil |
| Item Weight | 2.27 kg |
| Liquid Volume | 128 fluid ounces |
| Manufacturer | Red Line |
| Material | Synthetic |
| Model Number | 50305 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Package Information | Bottle |
| Part Interchange Info | 50305 |
| Part Number | 50305 |
| Recommended Uses For Product | Lube |
| SAE J300 Viscosity Grade | 75W-90 |
| Specific Uses For Product | Manual transmissions and transaxles |
| UPC | 083522503051 |
| Unit Count | 128 Fluid Ounces |
A**N
Scion grinding in 2nd or 3rd? This is what you need!
Wow, I am shocked! So I've been dealing with my gears grinding in 2nd and 3rd for the past 1 1/2 Years in my manual 2005 Scion XA the car has had the problem since before i bought it, The previous owners replaced the clutch, And I'm assuming that someone had added extra gear oil, Because it spilled out when i took off the fill cap on ramps, I've been trying to figure out the grinding, For the past 2 years doing everything but trying to put a new clutch in, Previous owners also stated that the mechanic may have put the clutch in wrong, I guess he didn't, Because this nearly completely fixed the issue in under 200 miles of driving, Driving has also become much smoother, If you have a Scion XA i suggest changing to this oil regardless if your gears are grinding! You only need exactly 2 quarts for the Scion XA no more no less, I wish all m mechanics would look this up before adding too much oil! I found this out from reading forms on the Scion XA, Everyone suggested this oil for the grinding and regardless! So i hope someone sees it here!
K**B
Seems to be a very good oem alternate
My 2007 Corolla 5 speed always had a โnotchyโ first gear engagement when coming to a stop and this was immediately gone when switching to this fluid. Keep in mind when i drained my transmission the old fluid smelled like it was at the end of its life and i have no idea which fluid was in it before as Iโve only put about 15k miles on the car in over a year and a half. Overall Iโm very happy with this fluid and it seemed to make shifting overall more smooth. Would recommend
C**R
Great gear box lubrication
Great product. I've been using it for 217K miles. My transmission still works like new.
R**O
Exactly what I needed.
Exactly as described. I needed the GL-4 for my 2015 Toyota Tacoma. The gallon size was more convenient for my needs.
K**R
Best for an AX-15 transmission.
Makes my old AX-15 shift better than a new one. The synchronizers in that old transmission didn't like the standard gear oil much, but this stuff has something in it that makes them work so much better. I've never had such ease of shifting than I've had with this.
G**E
Good stuff
Works great in my 2nd gen NV4500
T**Y
The only manual transmission oil I will ever buy anymore
I have used this in three different vehicles over the years. First was a heavily modified and tuned 2008 Cobalt SS turbo with the F35 trans. I tracked that car often, including high speed courses, autocross, and the drag strip. The fluid held up fantastically, and always shifted smooth and accurately. I also used the SSlowbalt for my commute at the time, which was 120 miles a day @80-85mph. I have since (sadly) sold my SSlowbalt, and mostly drive my wife's previous (now mine) car, a moderately modified and tuned 2012 Cruze Eco with the M32 trans, that we bought brand new. I have used MT90 in that since the first trans fluid change at ~50k (150k miles at the time of writing this, was changed with the same fluid at 100k, and about to do a third change next week.) This stuff shifts SO SMOOTH! I wasn't having issues in my Cruze before I swapped the fluid, but I did, and still notice, how much nicer the shifting feels compared to my buddy's 2012 Cruze ECO 6MT. This is 100% worth it. I have driven our Cruze to both US coasts, through 39 states, ontario, and numerous drives back home to Detroit from Lincoln, NE. I also use my Cruze for the occasional autocross event. Just all around smooth and quiet operation. I also have this same fluid in my 1999 Jeep Wrangler TJ with 213k at the time of writing this. The MT90 smoothed it out to the point where I was worried, because I was so used to that old AX15 shifting like a dump truck, or something haha. But not anymore! Totally smooth, no grinding on faster shifts (1-2 used to grind a bit if I didn't remember I was driving a brick and tried to shift it too fast). Now it doesn't matter if I accidentally shift a bit too quickly, because there's absolutely no grind at all anymore! My TJ isn't a pavement princess. I use it for what it was made to do, and I use it a lot. That trans gets a regular workout. It has been about 15k miles since I swapped it. TL;DR: If you like your manual transmission to shift like butter, quiet, and precise, buy this fluid.
C**Y
Good stuff
Great product!
K**N
This Gear Oil Literally Changed My Life
Well not really, but it brought my transmission back to life on the very first drive after putting it in. I can now get back into first and have almost completely cured my crunch getting into second. All other gears are just fantastic. Is it because my transmissions gear oil just hasn't been changed in too long, or is it because this product actually is magic? I'm not sure to be honest, but I will for sure be buying the same thing again next time. Bought for 1998 Jeep TJ and have a small amount left over which is also excellent.
C**E
Good oil
Good oil and GL 4 rated for older cars
A**ใผ
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M**S
All ok
Viskas gerai.
A**A
Excellent
Used it in my safari dicor. Awesome performance. but the price is on higher side.
Trustpilot
3 weeks ago
3 weeks ago