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#4604017 - 12/14/17 11:55 PM Best penetrating oil for oxygen sensors ?
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Acetone and transmission fluid ? I wish there was a way to put it in a spray can.

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#4604022 - 12/15/17 12:01 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
dishdude Offline


Registered: 11/14/08
Posts: 8727
Loc: Phoenix
They put anti-seize on them, they usually come right out.
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#4604026 - 12/15/17 12:05 AM Re: Best penetrating oil for oxygen sensors ? [Re: dishdude]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
dishdude, I wish I lived in your world; the perfect world. grin2

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#4604028 - 12/15/17 12:12 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Take 'em out while the exhaust is hot. Last time I replaced one on my Liberty, about 1.5 years ago, did it while it was hot with a shot of PB blaster, O2 socket and breaker bar, it came out so easily.
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#4604030 - 12/15/17 12:18 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
dishdude Offline


Registered: 11/14/08
Posts: 8727
Loc: Phoenix
Originally Posted By: Merkava_4
dishdude, I wish I lived in your world; the perfect world. grin2


No you don't, trust me on this. grin2

Hoosier makes a good point, get the slotted socket and don't use a wrench. I've never needed a breaker bar, all mine came right out with a ratchet.
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#4604031 - 12/15/17 12:21 AM Re: Best penetrating oil for oxygen sensors ? [Re: dishdude]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Yes I wanted to use a regular wrench, but there's no room to swing it unless I remove the transmission dipstick tube. I didn't want to take a chance on breaking that so I ended up getting one of those crowfoot style sockets.

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#4604034 - 12/15/17 12:25 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
HawkeyeScott Offline


Registered: 01/11/07
Posts: 785
Loc: El Oeste
I think more important than the oil brand is allowing whatever you use the time to soak in and do itís job. A shot of even SuperTech penetrating oil has yet to fail me if I use it the day before removal. And if you do it while hot, donít forget the gloves and sleeves.

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#4604041 - 12/15/17 12:46 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
KneeGrinder Offline


Registered: 11/28/17
Posts: 221
Loc: North of you Idaho

Spray it multiple times, over a 24 or 48 hour time period. That should help quite a bit. PB Blaster or any spray penetrator should work fine. All else fails, use a little heat. If it seizes and stops after it turns a little, turn it back in a little, blast it a few more times, wait, and commence process again. "Supertech" works fine!
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#4604087 - 12/15/17 04:58 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
dlundblad Offline


Registered: 09/30/13
Posts: 9999
Loc: Indiana
I don't think the penetrating oil was doing a thing for me when I was working on my truck. The threads went too far into the cat and I am sure they were covered with 20 years of carbon. 2 came off effortlessly, but 1 had it's threads destroyed. $30 part.

Did the GM assembly guys in May of 1997 use anti seize? If so, how long does it last? I am unsure of both..
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#4604093 - 12/15/17 05:31 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
dave123 Offline


Registered: 01/13/09
Posts: 2313
Loc: wi
Originally Posted By: Merkava_4
Acetone and transmission fluid ? I wish there was a way to put it in a spray can.
ohh you can or at least I can just need proper equipment to do it.

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#4604101 - 12/15/17 05:57 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18947
Loc: Sunny Florida
Just like kneegrinder said above: Hit them with PB blaster a couple of days beforehand. I like about three applications across up to three days, then they come right out for us...
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#4604113 - 12/15/17 06:36 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
Trav Offline


Registered: 11/20/06
Posts: 18829
Loc: MA, Mittelfranken.de
None work very well on an O2 sensor or spark plug, the fluid cant get past the gasket. You can spray it for a year and the threads will still be bone dry.
The rust comes from inside and the amount of corrosion is dependent mostly on climate and usage cycle, areas of low humidity and have higher year round temps will usually have no corrosion problems. Cars operated in short trip cycles in colder temps can have so much corrosion and carbon it can pull the threads or break the sensor or bung.

Get a deep 7/8 6pt socket and long extension with ball swivel on your car, cut the wire off and use a breaker bar or impact gun set on a lower setting to hammer it loose, heat the bung only with a smoke wrench if its not moving.
Running the engine doesn't help much, similar metals have similar expansion rates, steel sensor shell and steel pipe are expanding together when both are heated at the same time.
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#4604124 - 12/15/17 07:05 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
chrly919 Offline


Registered: 01/11/13
Posts: 70
Loc: Tennessee
Oxyacetylene if they get too stubborn..Just did this last week.
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#4604135 - 12/15/17 07:16 AM Re: Best penetrating oil for oxygen sensors ? [Re: Merkava_4]
malibuguy79 Offline


Registered: 12/11/17
Posts: 86
Loc: Maryland
Its really a [censored] shoot. Lube makes little to no difference. I found fords love to gaul up bad. Hope you dont have a ford
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#4604140 - 12/15/17 07:22 AM Re: Best penetrating oil for oxygen sensors ? [Re: chrly919]
Char Baby Offline


Registered: 05/25/05
Posts: 10015
Loc: ROCHESTER, NY
Originally Posted By: chrly919
Oxyacetylene if they get too stubborn..Just did this last week.


I was just going to mention using torches. If you're replacing the whole sensor with a new one, why not use )))HEAT((( ? Unless you don't have torches of course!

I mean, if you are only replacing the exhaust part and need to reinstall the same O2 sensor well then, using a penetrating oil is the only way...or if you don't have torches I understand this, as I don't have them either! laugh
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