amirza786
Senior Member
- First Name
- A
- Joined
- Oct 4, 2018
- Threads
- 87
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- 3,854
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- 3,947
- Location
- Northern California
- Vehicle(s)
- 2022 Polestar 2, 2010 Lexus IS 350 Sport
- Thread starter
- #46
There are two types of MT fluid: Non-extreme pressure fluids and Extreme pressure fluids, which gear oil falls under. Synchromesh MT fluid falls under non-extreme pressure fluid, which transmissions with synchros use. I'm not saying gear oil is not going to work, but in the long term it may cause damage to the softer metals that make up the synchros. For websites like Amsoil that have you put in your vehicle when picking the fluids, you will not find gear oil come up, although they do sell gear oil as wellYeah Motul is absolutely safe for gearboxes because it’s made for gearboxes, hence the name. It seems popular with the Subaru crowd. The oil squeeze out or flow rate is what makes the synchros action take longer as it’s more viscous. Honda designed gearbox for lighter oil. For that reason I am considering trying the Driven product, to make gear exchanges a little easier.
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