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Penetrating Oil

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Dusty MI View Drop Down
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    Posted: 15 May 2023 at 3:20pm
 Maybe 60 years ago I bought a can of penetrating oil, Rust Aid by Detroit Efficiency Company. That was the best I had ever had, and have never found any sense of the same. What is the best can be bought today ?

 Dusty
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Darwin W. Kurtz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Darwin W. Kurtz Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2023 at 3:26pm
make your own with 1/2 automatic trans fluid and 1/2 paint thinner. A salvage yard man told me they had freed stuck motors with this combination
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KMAG Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2023 at 3:54pm
While not as good as atf/acetone mix, Kroil works well. PB Blaster is a distant 3rd.
WD40 is around 80th place.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tbone95 Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2023 at 6:42pm
Originally posted by KMAG KMAG wrote:

While not as good as atf/acetone mix, Kroil works well. PB Blaster is a distant 3rd.
WD40 is around 80th place.

Yeah, WD 40 smells kinda good, and it ends there.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jgranat Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2023 at 8:55pm
WD40 is a rust preventative, not a penetrating oil. I like blaster, but I think heat penetrates the best.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shameless dude Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2023 at 11:35pm
I use JB 80 here. seems to beat out other penatrants. don't take much to work. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dirt Farmer Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 2:15am
CRC makes a product called Knock er Loose. You can get it at most auto parts stores, bad thing with it is that once you start using the can the spray pressure disappears in about a month then you have to squeeze the can to continue using it but works great and not bad smelling. There is also a product called freeze off that CRC makes that works good too, it uses a penetrating oil and extremely cold air in a can to loosen stuff
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Post Options Post Options   Thanks (0) Thanks(0)   Quote klinemar Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 6:02am

Here is a video of Penetrating Oil testing.https://youtu.be/xUEob2oAKVs
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 6:42am
In the beginning....the first 39 tries to make a 'displacer of water' failed.... then WD40 was created.
While WD40 does have it's uses, it's NOT a very good 'penetrating oil',as tests have told.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 7:00am
The answer to this is: "To each his own" I've had some thing stuck that KRIOL won't budge, others moved with PB Blaster. Right now I have a hub stuck on a MM U that nothing is working, home brews included.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clay Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 9:18am
I have a friend who swears by iodine. Have not tried it myself.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 6:05pm
Originally posted by Jgranat Jgranat wrote:

WD40 is a rust preventative, not a penetrating oil. I like blaster, but I think heat penetrates the best.

I think you have it right, there.  If its something unere about 1-1/4" I use this lil beauty:


Note, you don't have to heat to red, heat just long enough to get it smoking...

And, as shown in the vid, you can still snap off stuff.  I generally use a small impact, set to tighten, then to loosen, after the heating...Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DougG Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 6:40pm
In my opinion, there all about the same- just a little oil lube in a simple spray can, we got that kroil at work - expensive,, 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tbone95 Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 7:59pm
Originally posted by DiyDave DiyDave wrote:

Originally posted by Jgranat Jgranat wrote:

WD40 is a rust preventative, not a penetrating oil. I like blaster, but I think heat penetrates the best.


I think you have it right, there.  If its something unere about 1-1/4" I use this lil beauty:


Note, you don't have to heat to red, heat just long enough to get it smoking...

And, as shown in the vid, you can still snap off stuff.  I generally use a small impact, set to tighten, then to loosen, after the heating...Wink

Is that really worth a winky face?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 8:11pm
my new thing is free all , i have been using that for about a year or two ithink its the best rust buster penitrating oil i have ever used but much for lubricating .  the better lubricating penatrating oil that i have useing is shaffers pentro90 . istill use texas refineries essental lube for penitrating oil when i am heating parts with the torch it really thats alot of heat 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JC-WI Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2023 at 2:37am
This can I got at an auction, Nut and bolt loosener, and it really did loosen stuff but sadly, I can't find anything about who sold the stuff ormade it other than PRESTO is on the can.  wish I could find another  can of that stuff.
https://www.allischalmers.com/forum/uploads/242/Presto_s.jpg
It sure beat everything I have tried lately.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote klinemar Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2023 at 6:18am
I do like WD40 because of the straw feature on the can. As for best product, I don't really care! In some situations any lubricant would work. In other situations your using a cut off wheel or the "Hot Wrench"!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iowallis Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2023 at 10:28pm
Originally posted by Dirt Farmer Dirt Farmer wrote:

CRC makes a product called Knock er Loose.

At work the maintenance mechanics use this stuff, haven't tried it myself. As a joke when one of them got married (and mentioned starting a family) on his can on his cart they taped over the "loose" and put "up".

Most times I use the 50/50 mix. Have a can of Kroil for extreme cases as that stuff is expensive. Bought a can of Free All to take to the salvage yard but can't say how it would work on an extremely rusted/stuck bolt/nut.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AC7060IL Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 9:32am
Originally posted by Darwin W. Kurtz Darwin W. Kurtz wrote:

make your own with 1/2 automatic trans fluid and 1/2 paint thinner. A salvage yard man told me they had freed stuck motors with this combination
2x.

Definitely add heat for toughest items. If possible, try to heat the item that you’d like to expand. If you can’t expand the ideal part, then Heat will transfer very well on attaching part(s). One time I was able to successfully remove a corroded semi truck’s engine starter mount bolt by heating the bolt’s head(only piece I could access with torch heat). It was a Steel bolt threaded into an aluminum transmission bell housing ~ so decades of corrosion between different metals. Took two heat cycles(dull red color). Heat up, let cool, do again.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ACinSC Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 11:31am
For those of us without a welder or torch is there any handheld propane style torch that will get hot enough ? Thanks 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 1:41pm
I think the MAP gas torches produce more heat.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ACinSC Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 3:30pm
Thanks Steve ! I'll check them out .
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Post Options Post Options   Thanks (0) Thanks(0)   Quote klinemar Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 7:34pm
This link explains MAPP Gas. To get a heat hot enough Oxygen is required. https://en.wikipedia.org/wiki/MAPP_gas
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ACinSC Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 7:50pm
Thanks Mark!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Walker Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2023 at 12:29am
I thought WD 40 is a moisture displacement. Try 50% ATF, 50% Acetone, season to taste, heavily slather on some brake fluid, again season to taste, and let her rip. The acetone will evaporate quickly, so act accordingly. Pour it in the toilet if stomach pains occur. See a Doctor either Jill or Kamala if erections last more than 4 hours. Should you land nose first get it as hot as you can and melt a candle on it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote D19allisowner Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2023 at 11:37am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ACinSC Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2023 at 11:47am
Thanks Jim . That would be nice to have !
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