I think the wildest think I ever did with tcw3 was with my uncles abandoned Frankenstein dodge caravan... he had a van that was bored .050 over and the tranny was modified to tow (lots more then ur average van )
He died, and his car/thing sat for 2 years... his daughter didn't want it at first but then when her car blew up she wanted it, go figure...
Anyways, to shorten it up... we drained the gas, got it running on premium and my scanner threw up 3cylinders misfiring and some were dirty injectors, along with egr systems, the usual [censored] with a misfire...
She drove it for a week, and the van got worse, she was down to 8mpg highway and she thought it was junk... as a last ditch effort ( local junk yard offered a [censored] of a price cause he knew what my uncle did to it and wanted it) i put 3.5oz of tcw3 in a 5gallon can and dumped it in the van that was on empty... i let it idle for an hr, and noticed van stopped shaking and the stumble off idle was gone... took it for a spin and although it was smoking, it was driveable....
My aunt drove it for the remainder of the gas, and when she asked what i fixed i just played it off like (nothing really)
She gave me her gas card, i put 20gallons in it and added 5oz of tcw3 at the pump.... she drove the van to work for a month on that tank, and she said it was back to normal... i plugged my scanner in and ALL THE MISFIRE CODES ARE GONE !
My dad and i still laugh about that event to this day, this was in 2010after my uncle got sick and died....
Once when my uncle was alive, is daughters s10just turned 312000miles, her light came on and showed a bad cat and #2misfire. He added 8oz to her half tank, let it idle till it smoked, and drove it on the highway for 40miles and let it sit over night...
Started it up the next morning saying (if it breaks I'll just rebuild it ) and sure enough, the truck purrrrrrred like a can and her mileage went up afterwards.. (she never added tcw3 tho after the initial fixing dosage )