I had what would seem to be luck with restore in a mazda 323 with 250+m on it. really quieted down the engine, and seat of the pants was better. FWIW, the car lasted at least 30k after that. I added it every 2-3 dino oil changes. sold the car after about 15k, and the guy I sold it to drove it for 1 1/2 yrs, and sold it. still running fine.

so, on that engine, it did not hurt it, it seems.

Of course, I did not film any engine sumps, or do any tests on it at all. but it did seem to help, increased power, hill climbing. it seemed.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.