Back in the late 50's it meant "Stop That Pounding", later it stood for "Studebaker's Tickled Pink".
I used it in my 50 Olds 88, so much blowby it wouldn't crank fast enough to start when it was hot. STP,"compression in a can" to the rescue. Another product called Superflow was just as good at half the price, it went out of buisness around 59 - 60.
Ah the good old days,
Kam
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