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Approved C8 DCT Fluids

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Old Sep 17, 2025 | 06:24 AM
  #21  
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Originally Posted by JessLeroy
Do you need to purchase Techline connect $4000+ to flash TCM on GM cars with this Topdon j2534 tool?
No, you can purchase a 2 year subscription for one vin for $45.
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Old Feb 6, 2026 | 01:30 AM
  #22  
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I'm looking to do my first DCT fluid change on my 2021 Stingray Non-Z51. Does anyone know if it's okay to mix Motul High Torque DCT FFL-4 fluid with the AC Delco FFL-4 fluid that was filled in the car from factory? I'll likely be doing the drain and fill. Just curious if anyone has used a different kind of DCT fluid and can confirm that they haven't had any issues. Thanks!
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Old Feb 6, 2026 | 11:31 AM
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Originally Posted by redc8corvette
I'm looking to do my first DCT fluid change on my 2021 Stingray Non-Z51. Does anyone know if it's okay to mix Motul High Torque DCT FFL-4 fluid with the AC Delco FFL-4 fluid that was filled in the car from factory? I'll likely be doing the drain and fill. Just curious if anyone has used a different kind of DCT fluid and can confirm that they haven't had any issues. Thanks!
I commented on this question in post 72 here. It does not really answer you question directly, but it provide some info you may find useful:


https://www.corvetteforum.com/forums...post1609425813
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