Valvoline Syncromesh
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6th Gear
Joined: Jan 2024
Posts: 6
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Race Director
Joined: Sep 2000
Posts: 11,132
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From: Missouri City, TX
Melting Slicks
Joined: Mar 2001
Posts: 2,665
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From: New Jersey
The Valvoline Synchromesh is a GL-4 gear oil, NOT correct for the C7 M7.
The M7 requires a fluid meeting Dexron-III (3) requirements, like GM 88861800, or Redline D4 ATF, or Mobil-1 Synthetic ATF.
Do not use an ATF fluid that meets Dexron-IV (4).
The M7 requires a fluid meeting Dexron-III (3) requirements, like GM 88861800, or Redline D4 ATF, or Mobil-1 Synthetic ATF.
Do not use an ATF fluid that meets Dexron-IV (4).
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Thread Starter
6th Gear
Joined: Jan 2024
Posts: 6
Likes: 1
Race Director
Joined: Sep 2000
Posts: 11,132
Likes: 1,905
From: Missouri City, TX
i have also used AMSOIL ATF and their TorqueDrive fluids in previous M6 vettes and both are DEXRON 3 fluids.
Tech Contributor
Joined: Oct 1999
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From: Charlotte, NC (formerly Endicott, NY)
After 6 years of track events I changed the original transmission fluid in my 2015, 3 years ago, using the GM fluid. Yes, there is some nibbling on the 1-2 shift if the transmission is cold (like all 6 and 7 speed Tremecs used in C5, C6 and C7 Corvettes), but it only takes driving a couple of miles to overcome it even in below-freezing temps.
Bill
Bill