Red Line 50204 SAE 75W80 API GL-4 Manual Transmission and Transaxle Lubricant (MTL) Car Gear Oil - 1 Quart

I've owned my 02 Acura RSX Type S since new in August 2001. It is still the best and most fun car I've ever owned in my 50 years of driving. The only complaint I've ever had was shifting from 1st to 2nd gear. The speed of the car, whether sedate or aggressive didn't seem to matter. The ratio jump between 1st and 2nd gears is substantial and it was always clunky, sometimes grinding. Down shifting was never an issue from 3rd to 2nd.In the last few years I've tried several things to improve the shifting. I started with a short throw shift lever from B&M which seemed to help, but in reality caused the shift cable end to bend, because of the design of the lever. What had helped was the removal of the rubber bushings that mounted the shifter housing to the floor of the car, the B&M kit included aluminum bushings to replace the originals. Mounting the housing solid took out unnecessary movement and wasted motion.This past February I swapped out the entire shifter mechanism for a billet aluminum unit that definitely improved things along with new shifter cables from the same source, K-tuned.This past Tuesday, I drained the Honda manual transmission fluid for the Red Line MTL. Almost immediately the shifting is smoother with no clunky 1--2 shifts.The car has 92,000+ miles on it. The trans oil has been replaced according to the manufacturer's outline, so this last change was 30,000 miles early.I really wish I'd known about Red Line MTL ten years ago. This stuff really works.Update: August 31. Since replacing the Honda manual transmission fluid with the Red Line MTL, I've been to Michigan and back and Wisconsin and back to St. Louis. I did normal maintenance on my car last weekend. Checked the transmission fluid and it was as clean as the day I installed it and shifting is smooth, almost effortless.

Used this in my Dodge NV-5600 6-speed manual transmission, truck as almost 200k and had Royal Purple last in it, there is a big difference in ease of shifting with this lubricant.

Used it for my 2011 Mazda 2. What a difference. Shifts so smooth. I don't know if it's the quality of this stuff or I was just long overdue to change my trans oil, but it really feels nice. I decided to go with this product despite being more expensive because of the reviews and reputation. Figure might as well use the best since the change interval is quite long and better products typically have a longer use life which would further extend the change interval. I'm sure anything would have been an improvement but to be the extra cost seems worth it.

2004 Jeep Wrangler TJ 4.0L was grinding from 1st into 2nd. Was afraid it was the syncros but thought I'd give a fresh gear oil change first. This solved the issue right away and the Jeep shifts so smoothly now, I can't even believe it. I used a little less than three bottles. The fill hole is on the side of the transmission, so get a fluid pump with a hose to pump it in to make your life easier. Great product.

I have been using Red Line MTL products for the last 10+ years in all of my vehicles. Previously I owned a 1992 Sentra SE-R which I purchased off a little old lady with less than 60k miles. After reading rave reviews about Redline MTL products on various message boards, I put it in my SE-R. Shifting was vastly improved especially on cold mornings. No more difficulty getting the vehicle in to reverse and silky smooth shifts to boot. I put over 100k HARD miles on this car before selling it and the transmission was just as smooth at 160k as it was at 60k. As a side note...Sentra SE-R transmissions were notorious for 5th gear pop-out. I never had to deal with this issue.I recently purchased a 98 Civic Hatchback with 150k miles as a daily beater. The transmission was somewhat notchy with a SLIGHT grind when shifting from 2nd-3rd gear. I put in this product and after 100 or so miles the grinding was gone and I experienced significant improvement in smoothness. It feels like a brand new transmission; not one with 150k+ miles.This stuff is worth every penny.

I used this on my daughter's car when I refilled the manual transmission after removing and replacing it to install a new clutch. It's working great.The most important bit of info I ran across was the difference between GL-4 and GL-5 spec. GL-4 tends to be for manual transmissions and transaxles whereas GL-5 tends to be specified for differentials and transfer cases. GL-5 contains additional additives that are harmful to typical synchronizer material in manual transmissions. Bottom line: use what is specified for your application.The majority of 75W gear oil that I found for sale at auto parts stores and online tended to be GL-5 and marked "includes additive for limited slip differentials" so this GL-4 Red Line synthetic gear oil was exactly what I needed!

Somehow this is one of the few brands that actually makes the exact fluid my owners manual says I need for my 3rd gen Mazda 3, and so far my transmission's been running smooth, so no complaints about the product!my only annoyance was that the bottle it comes with uses a smaller head and cap, so the standard fill pump I can fit on pretty much all other fluid containers (like coolant or engine oil etc, not that I use fluid pumps for those products) doesn't fit on this one, which was fairly annoying. Since I was on the ground under my car trying to fill the reservoir at an awkward angle, it would've been nice knowing at least the pump was securely attached, but that's a relatively minor gripe.