Red Line 58304 75W90 Non-Slip Synthetic Gear Oil - 1 Quart

I use this stuff for my classic 5 speed Alfa Romeo manual transmissions. Works great and actually helps the shifting and reduces 2nd gear synchro problems.I highly recommend Redline oil! Pay a little extra for excellent quality.

This oil corrected the bad shifting characteristics my 2024 Subaru wrx 6-speed. After the first change the transmission up and down shifted 70% better. So I changed it again the next day to get the remnants of the factory fill. The stick is smooth as butter now. Originally the car had to be shifted slowly which felt crunchy and to down shifting nearly required double clutching from 6 to 4 for passing. Now down shifting to any gear is effortless.

Definitely smoothed out shifts in my S3 Alfa Romeo Spider. Still needs a rebuild, but 3rd gear is no longer intermittently crunchy

Perfect for my 2020 Hyundai Kona

Helped a mistreated 97 Subaru Legacy Outback 2.5 5MT greatly. 3rd gear synchro felt damaged and 1st to 2nd wasn't very smooth. After the oil change going into 1st is not a issue and the transition to 2nd is smooth. 2nd to 3rd is much better and feels like the synchro is functioning better. Each drive it gets better with 3rd gear. While this won't fix damaged gears this will help and is excellent transaxle fluid for Subaru 5MT.

In 2012 I changed the transmission fluid on my 2002 Tacoma.I went looking for SAE 75w90, but couldn't find any.I ordered this and found out that it was synthetic. I knew I wasn't going to find the other stuff easily though so I gave in and used it.So, how does my truck shift now? Well, it's harder to get it into first now because those syncros are warn and this stuff has a very high coefficient of friction, so my syncros in first won't spin up as far as they used to.On the other hand, it's easier to shift the rest of the time.It's a good product, but I'd disrecommend using it on aging syncros. It's a good choice for high performance car though where everything is in good shape and you want fast shifts - it'll slow down that syncro right quick so you can shove it into gear.

There aren't many oils that will work in my application which is an old transaxle with brass blocker rings in the transmission. This works well in VW, Porsche and Corvair manual trans axles even with limited slip differentials.

This is specifically made for cars like a 2001 Subaru Outback manual transmission. The transmission is actually a transaxle, which makes a specific type of oil necessary for optimal performance and minimal wear. Redline has the best product for transaxle, and I’ll continue to use this.