That'd be a highly accurate description of Lucas Oil Stabilizer.
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Less oil circulation is not the solution in this instance. It's a short-term fix that will ultimately destroy an already tired engine.
Considering how expensive everything is and how bleak and tortured the future looks, applying some common sense to keep an old and tired vehicle alive takes precedence over "I want to be right." All of us are here to help, not to argue.
Conclusively, the vehicle in question is valued at precisely "priceless" to the OP. I've been in the very situation where all I had was a 30-some-year-old rust bucket that some dim-whit mechanic destroyed by incorrectly performing a transmission fluid change. I was left stranded and walking to work for a few months until I managed to buy another POS vehicle (it had numerous mechanical issues that cascaded into problems that no oil supplement could "nurse") that kept me afloat for a couple of years, which allowed me to buy a brand new vehicle (nothing fancy, it was a base Mazda 3). I have never used Lucas Oil Stabilizer in any of those. No fluid can fix mechanical problems. A seal conditioner and an engine cleaner are about the last few things one can try before fixing the actual problem. When you need your mode of transportation the most, just "nursing it along" doesn't cut it.