[mike in tucson]

When I was 16, I had a job changing oil in big trucks. The boss told me to put 1 QUART of STP in when I refilled the oil. We kept the 5 gallon can of STP sitting on top of a big heater... so it would pour. I had a 53 Chevy and one day I changed the oil....not knowing, I put a quart of STP in it also. I was really cold in the shop (except by the heater). When I got ready to go home, the Chevy 6 wouldn't even turn over...had to crawl under and pull the drain plug.....slow oil. The next morning, the STP still hadn't drained out completely. My first and last STP in a motor. But they gave t shirts and decals at the races back then.