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07-09-2022, 03:27 PM | #1 |
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Transmission Oil Comparison - Notes, Data, and Results
TLDR: Motul DCTF (and the stock LV 75W by association) is not acceptable for anything more than daily driving and possibly some spirited street driving. Oil broke down after 4 days of higher level AutoX events. I would suggest to use known/respected 75W90 weight Transmission Oil for any performance driving.
Preface: Got my BRZ in late 2021 and when I was waiting to receive the car, I noticed something in the user manual. For the 2022 BRZ, the only “recommended” transmission oil per the owner manual is GL4 SAE 75W or Low Viscosity (LV) 75W, which is a relatively rare fluid and is most likely there only for Fuel Economy standards. For those that run our cars hard, the standard for the last gen has been good quality GL4 75W90, so 75W and its low viscosity variants seemed too thin for any sort of spirited driving. As such, I decided to test out a known 75W Low Viscosity Oil and compare to my old standard of Motul Gear 300 75W-90. This was originally intended to be a “Shifting Feel” focused test against a known quantity, but there was some scope creep (as is usual with any car project) due to some findings. Results are as follows: Fluids Specs: · Stock - LV 75W (Assuming Toyota Spec) – Viscosity @ 100°C -> 6.3 ~ 6.7mm2/s – UnknownStock LV 75W Notes: · ~700 Miles, was only intended to be used as break-in oilMotul Gear 300, 75W90 - Baseline: · ~1350 Miles on the FluidMotul Multi DCFT - Comparison: · ~700 Miles on the fluidConclusion: The Motul DCTF is most likely a very good stand in for the stock transmission fluid, but is in no way good for anything other than standard driving and maybe some spirited weekend runs. Feel was better than stock, and it kept the fuel efficiency up. However, keep in mind that the 75W90 weight isn't in Owners Manual and as such, Subaru can deny warranty if they so choose. Note: Redline MT-LV also meets the Low Viscosity (LV) 75W requirements, but was not tested. I didn’t have time to test it with all the other AutoX events I was wanting to make, and with knowing that the Motul DCTF didn’t work even for AutoX made me skip it in general. However, it is a fully synthetic oil and may fair better than the DCTF. Maybe a future test for someone else, but I will stick with 70W90. Last edited by Brock H.; 07-09-2022 at 04:00 PM. |
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07-09-2022, 03:32 PM | #2 |
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Video of the DCTF Draining shows the how broken down the fluid is: Last edited by Brock H.; 07-11-2022 at 10:53 AM. |
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07-11-2022, 11:24 AM | #3 |
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I've always had positive experiences with Redline MTL products in both finicky Land Rover Manual boxes as well as Subaru Transaxle boxes. So I'd be curious how Redline Products stack up..
Redline doesn't have a recommendation for the 2022 cars on their site, but recommends MT-90 for 2020 cars (75W90 GL-4).. Redline Manual Transmission Oil Line-up |
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07-19-2022, 07:21 PM | #4 | |
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I did, it flowed basically the same.
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07-20-2022, 01:33 AM | #5 |
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Yeah, the one uoa I’ve seen on the OEM LV was 7.7cst at 100c close to the RL DCT at 8.1 when it’s new and I’ve not seen RL shear much in use so I agree with you. The OEM LV starts around 9cst for reference. Redlines LV is around 7 new, so maybe too thin for these transmissions.
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07-20-2022, 10:31 AM | #6 |
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I'm curious why you would put in fluid designed for a DCT gearbox into a manual transmission?
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07-20-2022, 04:53 PM | #7 |
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Per my initial post, Motul Multi DCTF meets Toyota LV 75W per public Technical Data Sheet (TDS). It was tested because for the 2022 BRZ, the only “recommended” transmission oil per the owner manual is GL4 SAE 75W or Low Viscosity (LV) 75W. I wanted to test if a commonly found fluid that meet owner manual specs works for any spirited driving. In the case of DCTF, it does not.
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07-20-2022, 04:59 PM | #8 | ||
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Quote:
I don't disagree, the point was that the fluid was breaking down after 4 days of autoX, and I took video of the change. The stock fluid I drained at 700mi was about this thin or slightly thinner if memory serves right. Quote:
That was one of the reasons I didn't test the redline. I did not want to go thinner than what I could find on the stock 75W LV. |
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07-20-2022, 08:18 PM | #9 |
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I have 9k miles on my car and way over 200 autox runs, the transmission feels just as good as it did when I bought the car.
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07-25-2022, 02:15 PM | #10 | |
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You might be surprised when you drain the fluid! If your fluid looks great, you may have a wednesday transmission. |
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07-25-2022, 02:26 PM | #11 |
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I had my oem fill analyzed by Blackstone after 16 track days, it was bad. It was more grayish than what was in your video. Replaced with Motul 75w90, after 10 days looked much better, but can still see the grayish tint. Gonna try 8 days next and see how that plays out. 1 track day = 1.5hrs ish.
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07-29-2022, 09:15 AM | #12 |
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For those of us who use the car for both Autocross AND daily drive it in sub-freezing winter conditions, is the heavier transmission fluid even practical? I'd rather not have to wait several minutes for the car to warm up before it's drivable.
I remember as a kid my Dad's car in the 80's was impossible to shift until it warmed up. I'd rather not have to deal with that. |
07-29-2022, 09:15 AM | #13 |
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For those of us who use the car for both Autocross AND daily drive it in sub-freezing winter conditions, is the heavier transmission fluid even practical? I'd rather not have to wait several minutes for the car to warm up before it's drivable.
I remember as a kid my Dad's car in the 80's was impossible to shift until it warmed up. I'd rather not have to deal with that. |
07-29-2022, 09:28 AM | #14 | |
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