There is NOTHING abrasive about Rislone. Man oh Man, it's VERY thin for one thing. It's got the be 5 weight, or less. I've pored that into a seized block. Two cases. Every two quarts I added mineral spirits, until it came out the dipstick, poured it down the intake until it flowed over. Injectors OUT. I let it set, for a week. Once a day on a shaker for 15 min or so..
It turned over by hand within two weeks. I was able to run a compression test. One hole didn't come up to scratch.. One liner, One piston, one set of rings, one pan gasket, one head gasket, rocker cover, and one valve cover. Under 500.00, for the Rislone, Engine, and the parts. 14,000.00 for a long block..plus labor.. They charged us for loading the block, and the weight. 250-300.usd
Still running as an on site, dump, last I heard. Saved an easy 15K. RISLONE! 30 years ago.
Marvel Mystery Oil is a great diesel fuel additive.. Again I like the smell!
Regards