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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499 reviews with 5 stars.

6 reviews with 4 stars.

0 reviews with 3 stars.

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3 reviews with 1 star.

Overall Rating

5.0

391 out of 396 (99%) reviewers recommend this product

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Summary of Reviews

AI-generated from customer reviews, which may include incentivized reviews.

The product is a highly effective penetrating oil that quickly breaks through rust and corrosion, allowing users to easily free up stuck, seized parts and fasteners across a wide range of applications...

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1 to 4 of 508 Reviews .

1 – 4 of 508 Reviews

Review 1

1 out of 5 stars.

Kroil

23 hours ago

March 18, 2026 Wednesday

Karl’s

Bowling Green, Florida

Review 1

5 out of 5 stars.

The product stands behind itself

2 days ago

I have a 2010 GMC canyon original O2 sensors sprayed one time waited four days. They came out like they was freshly put in little or no effort.

Originally posted on kroil

Skooter

Menifee California

Review 1

5 out of 5 stars.

Best penetrating oil made

13 days ago

I've been using Kroil for 40 years and haven't found anything on the market that compares.

Yes, I recommend this product.

Originally posted on kroil

Bob 634

Kokomo, Indiana

Review 1

5 out of 5 stars.

Best on the market

15 days ago

Used this for many years in an industrial setting. I highly recommend this product over the others we did have at our disposal due to the fact it actually works! Personally, I found that heating up stubborn nuts/bolts and then using Kroil it seemed to draw it in a bit more, keep in mind this was in an industrial setting with very large equipment where use of a torch was common to speed things up. But if you have time to let it 'soak' on big or small stuff it works very well.

Yes, I recommend this product.

Originally posted on kroil

Kroil 10 oz. Penetrant with Silicone Aerosol

Neighbor’s Club Members earn points with purchases.

Kroil 10 oz. Penetrant with Silicone Aerosol

Neighbor’s Club Members earn points with purchases.

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Kroil

The product stands behind itself

Best penetrating oil made

Best on the market