Mouse Milk Penetrating Oil – Standard Yellow

World Wide Filter

MOUSEMILK8OZ

Sale price $8.17 Regular price $10.21

Shipping calculated at checkout.

Mouse Milk Penetrating Oil – Standard Yellow Formula, 8 oz & 32 oz

Industry-trusted penetrating oil designed to break down rust, corrosion, and friction in hard-to-reach areas—ideal for aviation and mechanical applications.

  • Fast-Acting Penetrant: Quickly loosens frozen nuts, bolts, valves, and linkages.
  • Superior Creeping Ability: Reaches deep into threads to break up rust and corrosion.
  • Multi-Purpose Use: Ideal for manifolds, mufflers, chokes, rods, pistons, and more.
  • Long-Lasting Lubrication: Reduces friction and resists oxidation over time.
  • Available in Two Sizes: Choose between 8 oz squeeze bottle or 32 oz refill jug.
  • Professional-Grade Performance: Used by mechanics, technicians, and pilots industry-wide.

Want easier application? Use with the Mouse Milk 16 oz Refillable Spray Bottle for precision delivery and reduced waste.

Mouse Milk Penetrating Oil delivers unmatched performance when it comes to freeing rusted or seized parts. Known as "Muscle in a Hustle," this powerful yellow formula rapidly penetrates threads, fittings, and tight spaces—dissolving rust and corrosion while providing lasting lubrication. Whether you're working on aircraft engines, automotive components, or precision tools, Mouse Milk is the go-to choice for reliable maintenance results.

Thanks to its unique creeping ability, Mouse Milk flows into microscopic gaps where other lubricants fail, making it an excellent choice for engine tear-downs, heat risers, smog valves, frozen valves, and more. It also functions as an effective cutting and tapping fluid during machining operations.

⚠️ Not for sale in California: This formula exceeds California VOC limits.
➤ For a compliant version, shop the Mouse Milk VOC-Compliant Purple Penetrating Oil.

Technical Specifications

  • Volume Options: 8 oz squeeze bottle or 32 oz refill jug
  • Formula: Standard petroleum-based (yellow)
  • VOC Compliance: Not compliant in California
  • Shelf Life: Approximately 10 years (sealed)
  • Use Cases: Penetrant, lubricant, cutting/tapping fluid
  • Applications: Manifolds, mufflers, pistons, chokes, valves, hinges, guns, outboards, rods and reels, nuts and bolts

Customer Reviews

Based on 3 reviews Write a review

Customer Reviews

Based on 4 reviews
100%
(4)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
a
audif150
Best penetrant on the market bar none,....

I worked as an aircraft mechanic for many years and was introduced to this product in my junior years and never looked back.
this thing is amazing on the most rusted out bolt treads, it some how creeps in and loosens without applying any heat.
I am retired now and since then I have tried many other name brands to compare on different projects but nothing comes close to Mouse Milk!
Highly Recommended!!.

J
John Andolina
Mouse Milk is fantastic.

Works where others can't. A little goes a long way and it can be used over and over. Shipping is fast and professional. 5 easy stars!

M
Marty D
Stuff works

When working as a contractor on US Air Force aircraft overseas we would rebuild small engines that were turbo-charged. Each time the turbo bolts would be frozen in place. I'd witnessed countless tools destroyed; sockets, ratchets, extension, you name it. But after a few drops of Mouse Milk we would break for chow, come back and wallah, broke free with minimal effort. I keep this in my garage and bought a bottle for my dad and brother. We've all had had successful results.

C
Carolyn R Meyer
At least 10 stars

I have Mouse milk at each house. If you have any screw stuck this will get it loose every time. Just give it time to work. I had take apart a picnic table that had rusted screws. Worked on every one of them. Used on a door handle that was corroder, worked again. Buy it, you will love it. My son is an airline mechanic, that is how I heard about Mouse Milk. Cute name also. Tell your friends!!


Name Your Own Price!
Name Your Own Price!
Name Your Own Price!