I puchased a high mialage 1991 chevrolet k-2500 (489,000) and put another 80,000 on it when the thermostat stuck shut in the middle of nowhere near Cheyenne Wy. the engine got so hot it siesed it melted the water hoses to there nipples I was lucky enough to get into a conoco quick stop before she froze up it just sat there a pinging an crackleing when I bought it I took it to jiffy lube to change the oil and I told them I wanted to put the lucas in it as I provided . They tryed to tell me how good there additive are but I persisted so the reluctantly complied any way every now and then I would try to turn it over the starter could only move it a notch but it still wasnt cooling in place after one and a half hoursthe engine made a complete timing to timing turn boy was I glade to see her coming back to life I pulled the upper neck bolts almost out been there and shure enough tharr she blew antafreeze all over it worried me some about cracking somthing it already melted and blew out the heat sensere but before it got hard Itook some pliers and pushed it back onto it's base it was still so hot I couldn't stay by it long. another hour and it started the valves were rattling and it was running rough but it was running took a screwdriver and fished the thermostat out and tightend the bolts down again then I poured hot water out of the conocos coffee maker in the resivor it sucked it down no smoke,no steam out the exaust wow two gallons of water no leeks and the het guage is working it's still hot but it's getting quieter so I filled up the jugs of water and headed for home near Burns Wy. 25 miles and I have to say I do believe it is the lucas that saved that engine whitch pops thru the manifold and doesn't have the power it used to have but she will go to town and back as I ask her to! thank You for helping me keep my big gocart alive P.S. it is a chevy hard as a rock and this one now rides like one again thank you George Burback