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Old 01-11-2022, 05:40 PM   #4
Spaceme1117
 
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Drives: 2017 Camaro SS, 2011 Corvette GS
Join Date: Feb 2019
Location: Erlanger, Kentucky 41018
Posts: 607
I would change the fluid more often if it were me, at least every 10K miles.

The GM fluid does last a while but manual trans fluid can lose its properties way before the recommended change interval. And it will still look bright red but you can feel instantly the difference with fresh fluid.

I have the same transmission in my 2011 Corvette Grand Sport and the cost is really minimal as it only takes about 3 quarts and I do it myself.

I have used the OEM GM trans fluid which is very good.

Amsoil Torque Drive is the best fluid I have used (I've used Royal Purple, RedLine, and OEM GM). The Amsoil is smoother shifting than the OEM fluid and has much better cold weather shifting properties.
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