+1 to mountainbike’s comments.
Quite a few years ago, I recall asking my trusty indy mechanic for his opinion of Slick 50, and he told me a little tale that scared me enough to avoid ever using that product. He told me that he had recently acquired a low odometer-mileage, older Lincoln that was in very good condition. He had been the car’s regular mechanic for most of its life, and was aware that it had been very well-maintained by its elderly owner, prior to his death.
His plan was to detail it, give it an oil change, check it over for any other new problems, and then sell it. Since he had a qt of Slick 50 sitting around (for reasons unknown to me), he decided to use it in conjunction with the new oil. Well, according to the mechanic, a few hours after the oil change, while he had the engine idling during the course of doing an emissions check, the engine seized!
Yes, it had enough oil in the crankcase.
No, there were no leaks.
So, this engine, that had purred along for something like 8 years/50,000 miles suddenly went to that great engine graveyard in the sky shortly after having Slick 50 added to the crankcase.
My mechanic willingly admitted that he couldn’t prove that Slick 50 was the source of this catastrophic failure, but without any obvious other causes, he strongly believed that this stuff did cause the engine to seize.