Red LineMTL Manual Transmission Oil- Pack of 4 Quarts

I put this in my 2012 BMW 135i manual transmission with 34k miles on it. With the original fluid, after about 1 hr of city driving it seemed like the fluid got too hot and thin and I had difficulty engaging 1st from a standstill. All gears were also quite notchy.The Red Line website says to use D4 ATF but I decided to try MTL which is a bit thicker due to my high temp issues in Florida. I only needed about 1.9 qts of Red Line MTL, and drained about 1.25 qts of the original fluid.I could immediately feel an improvement in the shifts. The notchiness was pretty much gone and all gears engage like butter now. Don't pay attention to BMW's 'lifetime fluid' recommendation. It doesn't cost much, it's easy to DIY, and the transmission feels amazing now.

So here's the story. I have a 2007 Honda Civic with the 5 speed manual trans. It's a good daily driver all told. At about 90k miles it started getting tough to get into second gear. Sometimes the synchro refused to spin up the gear before engaging leading to destructive "gear" grinding, other times the blocking ring would not get out of the way of the dog clutch teeth. It quickly got worse to where 2nd was practically unusable at 95k. Damn!! A Google search showed that I was not alone; in fact I was part of a huge mob of unhappy Civic owners. A reman trans with installation will ding you roughly $3000 USD plus or minus (and that's without a new clutch and throwout bearing which you'll want to do if you're in there). For a 10-ish y.o. car that made me gag, and quite unhappy too. The specified oil change interval is 120k miles so I wasn't there yet.The Honda fan boys who had the same problem said that draining the trans oil and refilling with the specified Honda lube did nothing beneficial (except putting a few bucks into the mechanic's wallet). But they also said that draining and refilling with Red Line MTL *did*. So I popped for 4 quarts (the Civic manual says it takes 1.8 quarts but it is really about 2 quarts)....2 quarts to try it out and 2 more in case I wanted to change it again "down the road", so to speak.And it worked! It's not perfect; about once a month I can feel it balk going into gear so I move the lever back to neutral and try again, and then it goes in. It's a whole lot better than a spendy transmission replacement. The car has about 107k miles on the clock as of this writing. If you're one of that unhappy mob as I was it's worth a try.A quick note: Whatever lube you feed the trans, make sure it's rated GL4 and not GL5. GL5 contains a sulfur additive and will slowly consume "yellow metal" alloys which the synchro cone clutches are faced with. If it says GL5 and also meets GL4.....NO GOOD. It has to be only GL4-rated. The Red Line is the proper GL4 formulation.

Drained OEM fluid and installed Redline MTL 50204 when I bought my car (50k miles). Immediate and dramatic improvement in smoothness, and reduced transmission warm up times in winter (this car gets daily driven even at -20F). Changed fluid at 100k when clutch was changed (both fluid and clutch change were premature, but I knew I was about to be without a garage for a couple years - long story). Car has 206k miles now and is feeling like it could use another fluid change as the shifts are feeling a little "notchy."Overall I couldn't be happier with this MTL. Never once have I gone easy on this car; like most Civic drivers I shift at 8,000 RPM for no reason whatsoever, and always joke the trans is going to split in half, but it still shifts as smooth as a brand new car.Don't forget to buy a pump for installation, and ideally replace the aluminum crush washer.

Use this product in two of my vehicles. The Jeep is a highly purpose built off road vehicle. The 4runner has 276k miles on it and is used as a daily driver. Both vehicles are over 20 years old. The difference in shifting was noticeable almost immediately after changing. Great product!

Recently purchased a 1976 bmw 2002. Previous owner said the transmission could use a rebuild as the 2nd gear was worn. I thought "Why not try what some Bmw 02 owners are calling the miracle oil. " I proceeded to do the drain and refill and when I did my first test drive I was scared to shift to second to get the same old crunch so I shifted very early in the revs. No crunch!. I was "hmmmm" So I decided to go a little higher in rpm's where I knew it would hitch up and make a noise...NO NOISE. Let's just say I said "h*ly *h*t several time cruising around the block and allowing the new fluid to work in. Anyone with a classic BMW? USE THIS!! It may keep you from that costly rebuild.