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Red Line MT-90 Manual Transmission Lubricant (75W90 GL-4)

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Brand: Red Line Synthetic Oil

MT-90 is specially formulated to provide the perfect coefficient of friction for optimum synchronizer performance in manual transmissions and transaxles. This results in smoother shifting at high or low temperatures and enables higher speed downshifting. MT-90 is rated as a 75W90 gear lubricant and provides GL-4 gear protection.

We also offer Red Line MTL (Part No. 1693-MTL), which is rated as a 70W80 gear lube, and Red Line MT-85 (Part No. RL016), which is rated as a 75W85 gear lube.

Note: Due to import restrictions, we are not able to ship this product to Mexico.

Enter desired order quantities below, then click the "Add selected quantities to cart" button.

Order Qty
Part No.

Condition: New

Red Line MT-90 (GL4), Quart

1 to 11: $17.95

12 to 47: $16.32

48 & up: $14.68

In Stock
Related Product Groups
Red Line Gear Lubricants

Old transaxle standby


I've used this in my old '78 Lotus Esprit and now also in my Lotus 61 Hewland trans.


Sebring, Fl.


Yeah, baby


I have used this in my Bugeye Sprite gearbox for 15 years. It is like a gearbox tune-up in a bottle. I threw it on the order to get free shipping.

Fat Charlie

Canton, OH


Works Great


I use this exclusively in my Miata. Probably overkill for a mostly street car, but it noticeably improved the feel and experience of using the transmission.

Niles Stonne

Milwaukee, WI


Red Line MT-90 Manual Transmission Lubricant (75W90 GL-4)

4.7 3