Royal PurpleROY01512 ROYAL PURPLE SYNCHROMAX QT. TRANSFLUID, 1 Quart (32 Ounces)

It works well for my friend’s manual Jeep. It makes it shift a lot better and it is pretty good quality. It is say to put in if you have a pump to pump it in from the bottle to the transmission. It helps to stop leaks and is quick to dip it in. The only issue is that it is expensive.

If you're like me and love your car more than you love most people, then you'll want to treat it to the Royal Purple-ROY01512 ROYAL PURPLE SYNCHROMAX QT. TRANSFLUID. This stuff is a game-changer!I was hesitant to try this transmission fluid at first because I thought my old stuff was doing just fine. But boy, was I wrong! The Royal Purple-ROY01512 ROYAL PURPLE SYNCHROMAX QT. TRANSFLUID has taken my vehicle's performance to the next level. It's like giving your car a big hug and telling it everything will be okay.Shifting gears has never been smoother, and my fuel economy has improved since using this product. Plus, it's a synthetic product, which means it's more durable and longer-lasting than your ex's attention span.The 1-quart bottle is easy to use, and it's compatible with most manual transmissions. The only downside is that it doesn't come with a built-in unicorn horn or a miniature disco ball, but I guess you can't have it all.Overall, I highly recommend the Royal Purple-ROY01512 ROYAL PURPLE SYNCHROMAX QT. TRANSFLUID to any car enthusiast or anyone who wants to protect their transmission and make their driving experience a little bit smoother. It's a 5 out of 5 in my book, and my car agrees (or at least, I think it does).

I replaced the manual transmission fluid and differential oil in my 1998 BMW 323is, both of which hadn't been changed in at least 100,000 miles. This fluid in the transmission and RP Max Gear 75W-90 in the differential. I expected some improvement, but it runs much quieter and smoother than I thought it could. Sometimes it is like I nudge the shift and it sucks it into the gear I want. Really surprising how smooth it is. And my car is quieter even though I never thought it was noisy before. Now the main sound is the engine when accelerating and if I'm at cruising speed I just notice the quiet.Having said that, I should note that the existing transmission fluid was black and only about 1/4 to 1/3 full. There was some form of slow leak since the transmission was caked with dirt and oil yet I never had stains where I park my car. So I'm comparing to what was an obviously under-filled transmission with old fluid. The first 50 miles or so after replacing the oil the shifting was notchy and terrible and I was thinking I'd have to put something else in. I was also worried I'd fried it due to low fluid. But then one day it shifted smoother, and the next even smoother, until it was noticeably better than before. Now a week later I'm really impressed.Forgot to mention my transmission is one of the manual ones that take automatic transmission fluid (Getrag) and this is rated for that usage. Also I've noticed I have to go to 2nd gear much sooner now because the car gets to speed much quicker. So it seems to be responding better to the throttle as well. That seemed to have happened right after the change but I was babying the car due to the rough shifting so I only really accelerated normally a few days ago.Update 06/2012 - Several tanks of gas later and my MPG is higher. Really improved the highway MPG, and it just did 32.09 MPG, doing the relatively flat round trip Los Angeles to Palm Springs plus some other mainly highway driving. My car has been getting 23 to 24 for the last two years and maybe 25 to 26 before that. I've only hit 32 mpg once before in August 2009, and have had only 6 tanks of gas get over 30 mpg in the almost 12 years I've owned the car. Stop and go driving is just slightly higher than before though as the prior three tanks of gas were 23.03 mpg, 27.38 mpg, 24.99 mpg.Update 10/2012 - The mpg the last 3 tanks of start and stop local driving were all over 27 mpg. The EPA estimated mpg for my car was 17 city/ 25 highway. So it seems to be doing well given it has the original engine and transmission.

used in my MKIV Supra V161 transmission and it shifts smooth

I have a 88 F250 with the ZF5 (5 speed) transmission and a 460 (7.5l) V8. This stuff is awesome, I've always liked Royal Purple oil, and have used several other products with good result. I decided to change out my gear box oil/ATF and wanted something that offered a little bit better protection for a manual gearbox, namely better protection for the "yellow metals" (like brass and Copper) that are used in manual transmissions. I was looking just to replace my existing fluid with something a little better, what I was NOT expecting was a significant change in performance... my gearbox now shifts MUCH more smoothly than before, it used to be a little hard to get into 2nd (you normally start in 2nd on a ZF5 when not rowing), especially if the gearbox was really cold. This thing is now as easy to shift as I imagine it was when it was BRAND NEW! It took about 50-100 miles for it to have this effect, but let me tell, it's awesome (and was entirely unexpected)! If you have a Ford with a ZF5 or ZF6, this is the right choice for your gearbox (oh, and transfer case too!) and although it's a little pricey, it's worth every penny! The 6 quart pack was enough to do both my transmission and transfer case with about a third of a bottle (12oz) left.

I have to admit, much quieter, smoother shifting. Not near the trouble finding second gear, as it did before changing to royal purple. I am very pleasantly surprised on how well my transmission performs now and look forward to a trip down the coast with the top down!

Will purchase again if needed