Which Penetrating Oils Brand Wins?

no visible rust formation at all; described as a tremendous product for preventing rust, definitely in the top three, probably top two, of all penetrating oils tested (referencing a prior, separate competition video on penetrating ability)

no visible rust formation whatsoever; graded an A+

very little rust occurred; host notes some rust at the top was likely wash-over from an adjacent untreated surface and was his own testing fault, and that the main treated area showed absolutely no rust; graded an A

described with marketing language about preventing rust on tractors and large equipment; performed better than the PB Blaster but not nearly as good as several other products; graded a B+

quite a bit of rust formation; graded a C

did an okay job, described as very close to CRC Knock'er Loose; graded a B

seemed to do better than Liquid Wrench, though the host notes Liquid Wrench isn't designed to prevent rust; the letter grade itself is garbled in the transcript, which reads 'I give CRC knocker loose at beyond an A through F scale,' most plausibly intending a grade of B, kept close to verbatim and flagged as uncertain rather than asserted with confidence

almost as good as CRC Knock'er Loose but not quite; more rust formation at the bottom, and the host notes the rust that was visible looked less severe than it actually was, going deeper into the metal than appearance suggested; graded a C

clearly outperformed AeroKroil in a direct side by side comparison shown on camera; the letter grade is garbled in the transcript ('I'd give PB blaster a bebas'), most plausibly intending a grade of B, kept close to verbatim and flagged as uncertain; host notes it is nowhere near as good as Royal Purple, and also had more rust than WD-40, though not a lot along the bottom

did not do a very good job; at best rated a C; better than the control but not by much, and better than brake fluid, but the host places it in the bottom two or three products tested; clearly outperformed by PB Blaster in a direct comparison

a tremendous amount of deep corrosion, far worse than even the untreated control; graded an F

not fazed by any of the three solutions including the harsh hydrogen peroxide-vinegar-salt mix; graded a solid A

excellent protective coating with no visible rust on the bolts; graded an A

a tremendous job overall; only a very small amount of rust on the head of the nut from the hydrogen peroxide-vinegar-salt mix, and absolutely no rust from the salt water solution; graded an A

did pretty good overall; some rust on the threads and a little on the bolt head from the hydrogen peroxide-vinegar-salt mix, some rust starting on the salt water bolt, and only a small amount on the water-only bolt; graded a solid B

very little rust on either the water or salt water bolts; graded a B, described as a decent job despite not being marketed as a rust preventer

did okay; quite a bit of rust on the hydrogen peroxide-vinegar-salt mix bolt, some rust starting on the salt water bolt, and a small amount on the water-only bolt; graded a C

quite a bit of rust on the hydrogen peroxide-vinegar-salt mix bolt, only a little rust on the salt water bolt; graded a C (the transcript appends a garbled trailing phrase, 'as well as the max,' after this result, left unresolved)

not advertised to prevent rust but did not do too badly; quite a bit of rust on the hydrogen peroxide-vinegar-salt mix bolt but very minimal rust on the salt water and water bolts; graded a C

did not appear to beat the control on the hydrogen peroxide-vinegar-salt mix bolt, but did better than the control on the salt water and water bolts; graded a C

not much better than the control on the hydrogen peroxide-vinegar-salt mix bolt; about the same as the control on salt water, maybe slightly more rust; did do better than the control in the plain water test; graded an F overall

worse than using nothing at all; the hydrogen peroxide-vinegar-salt mix bolt showed a large amount of corrosion that appeared to have sped up rusting; the salt water bolt looked about the same as the control; the water-only bolt looked slightly worse than the control; no explicit letter grade given in this second test, but qualitatively worse than the control across all three sub-conditions

claims to prevent rust and corrosion

claims to provide powerful rust and corrosion protection, and to penetrate to free up heavily seized parts

described as a metal surface protector and a carbon and rust inhibitor

does not claim to prevent rust; host tested it anyway out of curiosity

helps prevent rust and corrosion from reforming

described as lubricating and preventing rust

an ion-activated penetrating oil that does not claim to remove or prevent rust

claims to protect against further rust and corrosion

described in the transcript as an oil that prevents rust and is harmless to metal

many viewers have commented that DOT 3 brake fluid causes corrosion; host confirms brake fluid is highly corrosive