Turbo Rocket Fluid, unlike blinker fluid, actually was a GM product. A mixture of distilled water and methanol, sometimes with a rust inhibitor, used in the 1962 Oldsmobile Jetfire to cool the intake air and prevent engine knock.

Sold in a glass bottle stored the engine compartment or a one-gallon plastic bottle with Turbo-Rocket labeling.

https://www.theautopian.com/americas-second-turbocharged-production-car-was-so-complex-it-needed-something-called-turbo-rocket-fluid-in-order-to-keep-working/