SharkBit

Hello everyone, track season is starting back up and its time to flush my diff and trans. What fluid is best to run? I used Amsoil in C5Z and it made the transmission shift like butter. Is GM fluid acceptable or should I go to Amsoil in the C6? The car has 16k miles.

Thanks!

C66 Racing

I personally would go with AMSOIL again for both tranny and diff, but clearly I am biased. I think the stock fluids shear down in viscosity under demanding use like the track.

AMSOIL Torque-Drive Synthetic Automatic Transmission Fluid (Product Code ATD1G)
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)
AMSOIL Slip-Lock Differential Additive (Product Code ADATB)


If you do opt for the above (which are the same fluids I use in my C5 Z06 at the track), more than happy to get AMSOIL products for forum members at dealer wholesale pricing, about 25% below retail, via the AMSOIL Preferred Customer Program. Drop me a PM if interested.