Penetrating oil comparison

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Forum topic by bubinga posted 04-23-2011 11:44 AM 4486 views 0 times favorited 11 replies Add to Favorites Watch
View bubinga's profile


861 posts in 2665 days

04-23-2011 11:44 AM

Topic tags/keywords: resource tip trick restoration radial arm saw

Here is some information that I ran across, because I am starting to restore a DeWalt radial arm saw. Interesting stuff

Penetrating oil comparison
Machinist’s Workshop magazine actually tested penetrants for break out torque on rusted nuts. Significant results! They are below, as forwarded by an ex-student and professional machinist, Bud Baker. Don’t forget the April 2007 “Machinist’s Workshop” magazine comparison test.

They arranged a subjective test of all the popular penetrants with the control being the torque required to remove the nut from a “scientifically rusted” environment.

Penetrating oil ….. Average load

None …......... ......... 516 pounds
WD-40 …......... ...... 238 pounds
PB Blaster …......... . 214 pounds
Liquid Wrench ….. 127 pounds
Kano Kroil …......... 106 pounds
ATF-Acetone mix….53 pounds

The ATF-Acetone mix was a “home brew” mix of 50 – 50 automatic
transmission fluid and acetone. Note the “home brew” was better than any commercial product in this one
particular test. Our local machinist group mixed up a batch and we all
now use it with equally good results. Note also that “Liquid Wrench” is
about as good as “Kroil” for about 20% of the price. Your experience may vary, etc., etc.

-- E J ------- Always Keep a Firm Grip on Your Tool

11 replies so far

View hvroberts's profile


40 posts in 3279 days

#1 posted 04-23-2011 04:50 PM

I have been using a Penetrating oil that is put out at John Deere and find it to do quite well. I have not run a test like you have, Would be interesting to see how it does. Also, I would like to add that years ago when working construction we would get flat tire on the trucks, we tried everything to help loosen the lugg nuts. We found that pouring “Coca Cola” on the nuts and than going to lunch, by the time we got back the lugg nuts didn’t give us much fight at all. I have used it since and have had the same luck. The only problem I have now is that I drink “Pepsi”.

-- Hvroberts, Up North In Maine

View RetiredCoastie's profile


999 posts in 3180 days

#2 posted 04-23-2011 05:17 PM

We use Air-Kroil a lot at the hanger and it works really well. The product that I like the best is wintergreen. You can get it I believe at the drug store. Years ago we were removing the hinge pins from an aircraft that had folding wings and the hinge pins wouldn’t budge and we tried everything known to man. An older or I should say more experienced gentleman gave us a can of wintergreen that we soaked the pins in for 30 minutes and they came right out. Give it a try if the other ones don’t work.

-- Proud Supporter of Homes For Our Troops

View philip marcou's profile

philip marcou

264 posts in 2594 days

#3 posted 04-24-2011 04:53 AM

Now that is mighty interesting Bubinga- I mean your home brew. The WD40 result is not surprising and I am quite certain the stuff we get today is not the same as the WD40 used on oil rigs in the North Sea in the seventies.
I wonder how a mixture of diesel and acetone would work? The trouble with Acetone is that it kills you…..
If you look in Talkfestool I posted some pics etc of a rebuild on a Dewalt r/a somewhere in Marcou planes Progression pictures

View ScottN's profile


261 posts in 2677 days

#4 posted 04-24-2011 04:12 PM

nice post cr1

-- New Auburn,WI

View Dave's profile


11429 posts in 2837 days

#5 posted 04-24-2011 07:12 PM

I have been told that liquid wrench is brake fluid. I haven’t looked at the safety sheets to compare. But if we were in the middle of no where and my old dad needed something to break loose. He would get a little brake fluid and soak it. It usually would give.

-- Superdav "No matter where you go - there you are."

View NBeener's profile


4816 posts in 3171 days

#6 posted 04-24-2011 07:13 PM


Is this a comparison of penetrating oil, or a penetrating comparison of oil ??

I’m so confused.

I use PB Blaster, and to good result. I’m glad to see a bit of science to help put PB Blaster’s performance in context.

Thanks for posting this !

-- -- Neil

View Div's profile


1653 posts in 2937 days

#7 posted 04-24-2011 10:19 PM

No man, it is an oily comparison of penetration! ATF and acetone? I will give that a shot for sure, thanks dude!

-- Div @ the bottom end of Africa. "A woodworker's sharpest tool should be his mind."

View Gregn's profile


1642 posts in 2981 days

#8 posted 04-24-2011 10:28 PM

A question I have, was did they meaning, April 2007 “Machinist’s Workshop” magazine comparison test give a time frame to achieve these results? While the Average load poundage numbers are interesting, it would be interesting to know the time frame to achieve those results as well.

-- I don't make mistakes, I have great learning lessons, Greg

View NBeener's profile


4816 posts in 3171 days

#9 posted 04-24-2011 11:41 PM

Great question, Greg.

Looks like 8hrs of immersion:

-- -- Neil

View syenefarmer's profile


488 posts in 3078 days

#10 posted 04-25-2011 12:51 AM

In my very limited usage of penatrating oils I’ve found that PB Penatrating Catalyst performs much better than Liquid Wrench. Also, in a real world situation, how often can you actually immerse the nut you’re trying break loose?

View Dusty56's profile


11819 posts in 3685 days

#11 posted 04-25-2011 01:14 AM

Very interesting …are those foot pounds or inch pounds of torque ?
I see that it was actually power steering fluid , not auto trans fluid, that they mixed with the acetone.

-- I'm absolutely positive that I couldn't be more uncertain!

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