Best Penetrating Oil for a Seized Engine? Looking for Recommendations!

Oils & Fluids
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Seeking Help for a Seized Engine

I’ve been trying to get my old engine unstuck, and it seems like it’s really rusted shut. I’ve heard that penetrating oil can help, but there’s so much out there, and I have no idea which one to choose.

What I’m Dealing With

I have a classic car that has been sitting for years. I finally decided to restore it, but when I tried to turn the crank, it wouldn’t budge. After doing some research, I learned that penetrating oils could potentially help loosen the rust and help me free the engine.

What I’m Looking For

  • Product Recommendations: I’d love to hear about any specific brands or types of penetrating oils that have worked for you.
  • Methods of Application: What’s the best way to apply the oil? Should I soak it? How long should I let it sit before trying to turn the crank?
  • Combining Oils: Are there any combinations of products that have proven effective?
  • Tips from Experience: If you’ve successfully unseized an engine before, what techniques or tricks did you use?

Additional Info

Any advice or personal experiences would be greatly appreciated! I’m looking to restore this old beauty and get it running again, so I’m open to all suggestions.

Thanks in advance for your help!

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I’ve had great results with PB Blaster for getting seized engines to budge. It’s got a strong penetrative ability and is particularly effective on rusted bolts. Give it a try!

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Absolutely! PB Blaster is top-notch. I also found that heating the area before applying can help it soak in even better.

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I prefer using Liquid Wrench. It has a unique formula that some say penetrates deeper than others. Has anyone experienced similar results using it?

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I’ve tried Liquid Wrench too, and while it works well, I still think PB Blaster has the edge when it comes to more severe cases.

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I often use a mixture of acetone and automatic transmission fluid, which some mechanics swear by. It’s cheaper and can be just as effective. Have you tried it?

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That’s interesting, Kenneth! I’ve never heard of that mix before. How long do you let it sit before trying to turn the engine?

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Typically I allow it to soak in for a few hours, then gently try to move the engine. If it’s still stuck, I’ll reapply.

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I recently had a nasty experience with a seized engine. No matter what I used, it wouldn’t budge. Finally, some heat and repeated applications of WD-40 did the trick! :joy:

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Haha! Sounds like quite the ordeal! WD-40 can help, but it’s not a dedicated penetrating oil. I find it occasionally works, but usually, I steer clear when stuck bolts are involved.

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I think the effectiveness of penetrating oils may vary, depending on each engine’s condition. Over time, it also comes down to individual experiences. What has worked for others?

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Absolutely, Cruz! Also, consider the oil’s viscosity. Thicker oils might not penetrate as well as thinner ones. It’s really about finding that sweet spot based on your specific situation.

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I remember the first time I tried penetrating oil; I was so frustrated! It’s like trying to teach a cat to swim. :joy: Just keep at it, and something will give eventually!

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I love that analogy! Patience is key with these situations. If only those engines could just cooperate, right?

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I recommend using penetrating oils like PB Blaster or Liquid Wrench. Make sure to let it sit for at least a few hours or even overnight for the best results.

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Great suggestions! I’ve had success with both. Just remember to work the oil into the rusted area. A little heat from a torch can help too, but be careful!

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When applying penetrating oil, use a spray nozzle for even coverage. And definitely let it sit for at least 24 hours if you can! It really makes a difference.

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I’ve never thought of that! Thanks for the tip. Any tools you’d recommend to help break it free after oiling?

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A breaker bar or impact wrench can be super effective. Just make sure the area is well-lubricated first! Safety first, though—gloves and goggles are a must.

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Totally agree about wearing gloves and goggles! It can get messy with oil and rust flying around. Has anyone tried heat along with the penetrating oil?

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