Royal Purple Synchromax QT. Transfluid, 1 Quart

No he notado ninguna diferencia ni mejoría respecto al aceite de transmisión de la marca Honda. Esto quiere decir que es un producto caro para lo que ofrece.
Probé un producto de una reconocida marca alemana y he notado una diferencia importante, las marchas entran mas suaves y no me cuesta meter la marcha atrás.
Mi conclusión es que es un producto caro para lo que ofrece. El aceite de transmisión de la marca alemana es a mitad de precio y me va mucho mejor.

I have been running it in my transmission for a bit over a week now, it has not caused any issues with shifting and I think the transmission is actually quieter. I used it in my NV3500 1994 Dodge Dakota 4×4 application. It was half the cost of the factory oil, and the factory oil is getting very hard to find.

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.

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!

Been running this stuff in my manual transmission for over 2 years now. Figured I should leave a review. My transmission loves this stuff. Felt night and day smoother when I swapped it in. My transmission wasn’t even that old either.

This is good stuff. It made my gearbox far less ‘notchy’ and just generally slicker to use than the manufacturer’s official fluid.

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.