Red Line MT-90 Gear Oil- 1 Quart, Pack of 4

Red Line MT-90 is a top-tier synthetic gear oil that delivers noticeable improvements in manual transmission performance. I used it in a high-mileage 5-speed and immediately felt smoother shifts—especially in cold weather. It quieted down some minor gear whine and made engagement feel more precise. The GL-4 rating is perfect for transmissions that need protection without the aggressive additives found in GL-5 oils, which can be harsh on yellow metals like synchros. The viscosity is ideal for most import and domestic gearboxes that spec 75W-90, and it holds up well under heat and load. If you're chasing better shift feel or just want to treat your transmission right, MT-90 is a solid investment. It’s not the cheapest option, but the performance and protection are worth every drop.

Shifts very smooth in my 2009 mazdaspeed 3

1994 Eurovan 5 speed shifting as it should again. Shipping speed wss good. Packaging was good. It was bit pricey but there are cheaper alternatives. You get what you pay for.

Highly recommend using this in Porsche 944 transaxles. I have used this in 4 944s and each time the noise has gone down and cold shifting has gotten smoother. I also just tried it in a suzuki sx4 that had a transmission that made noise at idle and it has removed the noise and greatly improved the shifter feel.

I used it for a classic car manual transmission.