An old mechanic told me about the STP over 40 years ago. I had a 55 Ford 3 speed and that tranny would freeze up around 0 degrees. I had to back it in at nite and put it in first then drive 5 minutes in first before I could shift into second. He told me to just add 4 ounces to my tranny and I would be fixed. It worked it did not freeze and it shifted easier through the gears in any weather. I dont put it in my engines but I put it in every tranny I have had since then new or old.
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