I have used the stuff many times in old beaters, not sure if I would use it in a nice vehicle with no engine problems like bad bearings or low oil pressure.
I will say that one of the vehicles I used it in was my 1991 *-10 blazer. I swapped in a 350 small block and turbo 350 trans, lifted on 33" tires. beater / mud bogger / trail truck.
I always used lucas oil stabalizer in that because the bearings were all junk and it only held about 5 psi oil pressrure at wot. the motor knocked and smoked and ran OUT of oil on the trail many many times, but I just kept driving it. I wanted to test it to see how good it was. the engine lasted the whole summer, and I did NOT take it easy on it. the carb only had two throttle positions, wide open or off.
I will definatly use that stuff again, I think it is great stuff