The Original Penetrant since 1939, SILIKROIL, KROIL with Silicone aerosol is an industrial-strength penetrating oil formulated to quickly penetrate deep into small crevices. KROIL attacks rust and corrosion to help loosen frozen or seized metal fasteners such as nuts, bolts, screws, studs, hinges, tools, pulleys, chains or valves with the added benefits of silicone lubrication. Safe on all metals, it is ideal for stuck parts on cars, trucks, ATVs, fleet, farm and agriculture engines and equipment.

Corrosion Meets its Match

FAST-ACTING: penetrates small openings, threads and crevices
PRO GRADE: trusted by the professionals
SIMPLIFIES REPAIRS, MAGNIFIES MUSCLE: gives you all the leverage you need for those stubborn jobs
APPLICATIONS: Use on nuts, bolts, studs, screws, pulleys, shafts, valves, chains, tools, bearings, and any corroded threads or seized metal fasteners

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501 reviews with 5 stars.

6 reviews with 4 stars.

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4 reviews with 1 star.

Overall Rating

5.0

393 out of 398 (99%) reviewers recommend this product

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1 to 4 of 511 Reviews .

1 – 4 of 511 Reviews

DogDoc32

North Carolina, 28139

Review 1

1 out of 5 stars.

Bad product !

2 days ago

I bought a case of Kroil and so far 7 do NOY spray !! Had 6now 7 in same case ?

Originally posted on kroil

Toymaker

Southeast pennsylvania

Review 1

5 out of 5 stars.

Great product !

12 days ago

Yes, I recommend this product.

Originally posted on kroil

Joseph (Joe)

Moundville,Alabama

Review 1

5 out of 5 stars.

Wonderful product

14 days ago

We used your product last year while overhauling an old 1951 Model A John Deere tractor and it worked well with all the rusty bolts. We had a piston that was rusted in one cylinder and would not budge, we sprayed your penetrating oil in there and let it set for about 6 hours and with the use of a 20 ton hydraulic jack, we were able to push it out. Wonderful stuff. We keep a can on our shelf in case we need it.

Yes, I recommend this product.

Originally posted on kroil

Review 1

1 out of 5 stars.

Kroil

25 days ago

March 18, 2026 Wednesday

Kroil 10 oz. Penetrant with Silicone Aerosol

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Kroil 10 oz. Penetrant with Silicone Aerosol

Neighbor’s Club Members earn points with purchases.

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