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Thread: Redline MT-LV 70W/75W gear oil for 5 speed manual

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    Administrator Daox's Avatar
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    Redline MT-LV 70W/75W gear oil for 5 speed manual

    I was poking around today looking at different gear oils. Our cars call for a 75W80 gear oil. The 75W is the engine viscosity when cold, and the 80 is the viscosity when its hot. All oil is substantially thicker when cold, so getting a low first number is a good thing as it will always be thinner when hot. You just don't want it to get too thin, or you can accelerate wear in your transmission. Here is a chart to help illustrate things.

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    Therefore, I was looking to see if I could get a 70W80 or even 65W80. Alas, I can not find anything like that. However, what I did find was Redline MT-LV 70W/75W. You'll notice this doesn't follow the normal naming convention. So, I'm not exactly sure what to think about it. It is quite a bit thinner than Redline MTL 75W80 that many here have used.

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    Here are the viscosity specs of the two:

    75W/80 (OE spec)
    Vis @ 100°C, CSt 10.2
    Vis @ 40°C, CSt 50

    70W/75W
    Vis @ 100°C, CSt 6.5
    Vis @ 40°C, CSt 9.8


    For reference, 40C is 104F. That already seems warm for a manual transmission, but I haven't measured my transmission's temperature. Anyway, at 104F, you can see the 70W/75W is 5 times thinner than the 75W80 oil. Thats a heck of a lot less churning going on. Less churning means more power and efficiency.

    Anyways, I post this info because I am thinking about using it in the Mirage. I have contacted Blackstone Labs, a third party oil analysis company. I've asked them how they recommend I proceed with testing this oil with minimal risk to my transmission. I've used them many times in the past for engine oil analysis and they're very helpful.
    Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar, Upper grill block

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  2. The Following 4 Users Say Thank You to Daox For This Useful Post:

    dspace9 (12-21-2018),Eggman (11-30-2018),Loren (11-30-2018),MetroMPG (12-07-2018)

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