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Oil and engine additives

Do Stop Leak Products Work? Do They Damage Engine Seals? Will They Destroy an Engine? Let's Find Out

Feb 2023 · 19 min · 14 products tested

His winner

AT-205

It easily won the showdown for effectiveness of stopping oil leaks

Watch on YouTube

Results, round by round

Lubricity Wear Scar

Lower is better, in mm
  1. 1Bardahl6.52mmAmazon
  2. 2Liqui Moly6.85mmAmazon
  3. 3Lucas6.9mmAmazon
  4. 4Bar’s Leaks7.52mmAmazon
  5. 5Lubegard8.07mmAmazon
  6. 6AT-2058.42mmAmazon
  7. 7Hapco8.42mmAmazon
  8. 8Blue Devil8.53mmAmazon
  9. 9XADO8.8mmAmazon
  10. 10Seal Lube8.91mmAmazon
  11. 11Snake Oil9.22mmAmazon
  12. 12CD-29.33mmAmazon
  13. 13Justice Brothers9.33mmAmazon
  14. 14Wynn’s9.35mmAmazon

O-ring Thickness Recovery

Higher is better, in in12 of 14 products have agreed numbers, so no leader is marked
  1. 1AT-2050.21inAmazon
  2. 2Seal Lube0.2inAmazon
  3. 3Lubegard0.2inAmazon
  4. 4Justice Brothers0.2inAmazon
  5. 5Blue Devil0.2inAmazon
  6. 6Lucas0.2inAmazon
  7. 7XADO0.2inAmazon
  8. 8Hapco0.2inAmazon
  9. 9Bar’s Leaks0.2inAmazon
  10. 10Liqui Moly0.2inAmazon
  11. 11Snake Oil0.2inAmazon
  12. 12Bardahl0.2inAmazon

O-ring Hardness Recovery

Lower is better, in Shore A
  1. 1AT-20565.5Shore AAmazon
  2. 2Seal Lube73Shore AAmazon
  3. 3Justice Brothers74Shore AAmazon
  4. 4Lubegard75Shore AAmazon
  5. 5Blue Devil80Shore AAmazon
  6. 6Hapco81.5Shore AAmazon
  7. 7Wynn’s84.5Shore AAmazon
  8. 8CD-285.5Shore AAmazon
  9. 9Liqui Moly88Shore AAmazon
  10. 10Bardahl88Shore AAmazon
  11. 11Lucas88Shore AAmazon
  12. 12XADO88Shore AAmazon
  13. 13Bar’s Leaks89.5Shore AAmazon
  14. 14Snake Oil89.5Shore AAmazon

Gasket Puncture Force

Lower is better, in g12 of 14 products have agreed numbers, so no leader is marked
  1. 1AT-205430gAmazon
  2. 2Seal Lube446gAmazon
  3. 3Hapco492gAmazon
  4. 4Blue Devil526gAmazon
  5. 5Lubegard528gAmazon
  6. 6Justice Brothers542gAmazon
  7. 7Wynn’s686gAmazon
  8. 8Snake Oil704gAmazon
  9. 9XADO718gAmazon
  10. 10Bardahl724gAmazon
  11. 11CD-2760gAmazon
  12. 12Bar’s Leaks886gAmazon

Everything he tested

Results were read from the video's captions by two AI models, and only the numbers both agree on and that he says out loud are shown. Some results appear only on screen in the video. Check the video before you buy.