50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (2 Pack)

Get what you pay for, though pricey, irrefutable 'performance' gains: vehicle shifts much much much more smoothly now - no more 'crunchy' shifts, & all gears operate better in a wider range of temps as well. Prior to the fluid change, 1st & Reverse were the more difficult gears to get in to, especially in colder weather - before the fluid had a chance to warm up - now they all shift smooth as butter. I can also shift much faster as a result. Last little + is that the fluid doesn't smell horrid.

I put this in a 2002 Chevy Tracker (rebadged Suzuki Vitara) with a 5 speed stick transmission and lever operated transfer case. The factory specification calls for a 75w90 GL4 gear lube in both but a previous owner had put GL5 rear end gear lube in them. GL5 eats at the "yellow metal" brass/bronze used in the gear synchronizers in the transmission and transfer case. As a result of this the transfer case would not shift into low range and the 5 speed stick was very tricky to shift. Hard shifts, having to force it into gear, being stiffer when it was cold, just overall not smooth. I was worried because a friend with a Jeep had a similar occurrence and ended up replacing his whole transmission because it became unshiftable and wouldn't hold gears. Read a review of this Redline and it's specific use for manual transmissions. Figured it couldn't hurt and put it in the transmission and transfer case. IMMEDIATELY it was smoother to shift just sitting in the garage with the engine off. I backed out of the garage and was able to promptly push it into 4lo for the first time since I have owned it. Worked great and I backed right up a small hill without any trouble. Several weeks later it's shifting better and low range is back. I will say the transmission was obviously damaged and the transfer case is still not smooth going into low range but I CAN go into low range now and the transmission is definitely smoother. I can only imagine what this stuff would be like in a transmission in better shape than mine. It's not cheap but considering how hard it is to find GL4 rated 75w90 anymore (I bet your local parts store doesn't have it or has a few quarts at most) I'd highly recommend this Redline product.

Not much to say it is what it is cheaper than local auto parts store got here quickly

My 2007 Accord running ~12,000 mile-old Honda MTF was shifting stiffly when hot. Shifting was a deliberate, almost irritating process. Running MT90, shifting ease, smoothness, and synch speed is VASTLY improved; now it feels natural and effortless. I'm in S. Arizona so the 'thick' 75w90 is probably about right. Redline's lighter MT mixes may be better for cooler climates. Honda drivers should at least consider trying it!

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.

2003 toyota tacoma Xtra Cab 4x4 - 2.7L - 5spd Changed all the gear fluids 2x-3x in my 180k mile taco over the past 2 weeks. I let the tcase & trans drain for a couple hours (hot) & it took about 1.3quarts in the tcase and a little over 2.6quarts in the transmission. You could get by with 4 quarts, but I like the feeling of pumping it in until it dribbles out (which took 4quarts point something total; so i'd order 5quarts). And here is what I noticed: 1) An average of about 20miles worse mpg on an entire tank of gas compared to synthetic GL5 fluid (in manual transmission and transfer-case) (355miles @ 15.5 gallons vs. 375mi @ 15.5gal) 2) Much smoother shifting in manual trans compared to other older gl4 formulas & newer gl5 stuff. The clutch contains a larger friction zone. Now whether this extra smoothness actually causes more wear or not I have no idea. I'm pretty sure, people worried about copper or brass in your syncros or tranny / t-case need not be worried with the gl5 fluids. Most gl5 fluids say safe for brass on the bottle. Having said that - there's an obvious difference between safe for 100k miles and safe for the 400k i'm trying to hit. EDIT: changed my mind. Worth 5 stars. Saw the Walmart fluid after 10k miles. $#%& the Walmart GL-5 especially in hypoid gears. I'm serious... don't be stupid like me. I probably took 10k to 50k off my rear diff life (which I expect 400k out of) by running walmart fluid for 10k miles @ 90 to 105mph. If you're not going above 75mph or towing you might be ok. A word about fluid change intervals just from what I've seen in my truck (toyota recommends 30k miles for all fluids): Rear Diff - 30k is likely a tad long for the rear diff (20-25k feels better) - but I regularly drive thousands of miles at 90mph. If you aren't towing, driving about 80mph, or doing other stressful differential (for hypoid diffs) driving then 30k is probably ok. @ 70k-150k miles the rear diff fluid was black as hell and saturated with fine particulates Front diff - I barely use 4x4 (maybe 10x a year for 10 miles at a time. There was pretty much absolutely no wear on the front diff fluid in 70k miles. transfer-case - noticeable mechanical wear of oil (splashy - not thick like syrup), minimal particulates, but still good protection in 70k miles (change whenever) transmission - particulates and mechanical wear, decent wear on the fluid in 35k miles (stick with 30k-ish) Hope sharing that experience helps. Best of luck. P.S. - look at your power steering fluid (suck out the reservoir with a turkey baster & put in new stuff - drive & repeat). Ran 110k to 165k on the original ATF in the power steering system. That was risky.

Used in my 2002 7.3 with a ZF6. This stuff is awesome transmission is quieter and shifts smooth. Just wish Redline used a bag instead of the hard bottle. It is a real pain to fill the case but worth it.

I have a 2015 Scion XB (Toyota) manual transmission and changed it a few weeks ago and used that Ultra 1 GL-4 and my manual transmission started having clunky gear shifts. I just changed it to Red Line MT-90 that's actually recommended by Toyota and what a difference. Immediately felt the shifting smooth as silk. Oh well, live and learn. Buy what's recommended by the mfg because they know what they are talking about. My fault.