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#1108144 - 03/17/08 08:16 PM Best Engine Cleaning Additive?
ZZman Offline


Registered: 03/17/08
Posts: 4230
Loc: Michigan
I see numerous ones talked about in the forums. Which ones do you like in order of effective, experience from actual use, tests done, etc...

Auto-RX, Rislone, Marvel Mystery Oil, Seafoam ,plain oil changed alot, Synthetic Oil changed alot? Any others?


Edited by ZZman (03/17/08 08:24 PM)
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#1108149 - 03/17/08 08:26 PM Re: Best Engine Cleaning Additive? [Re: ZZman]
cosynthetics Offline


Registered: 02/27/08
Posts: 446
Loc: Mid Ohio
The biggest one you'll hear about on here is the Auto-RX. I'm still very skeptical but I'm sure that's the one that'll get recommended the most.

This probably should've been posted in the additive forum.
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#1108160 - 03/17/08 08:33 PM Re: Best Engine Cleaning Additive? [Re: cosynthetics]
cosynthetics Offline


Registered: 02/27/08
Posts: 446
Loc: Mid Ohio
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#1108173 - 03/17/08 08:39 PM Re: Best Engine Cleaning Additive? [Re: cosynthetics]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
ARx is far superior to the others mentioned.

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#1108181 - 03/17/08 08:43 PM Re: Best Engine Cleaning Additive? [Re: ZZman]
cristphoto Offline


Registered: 05/25/06
Posts: 53
Loc: Maryland
I believe unless your car has very high mileage, simply using Chevron, Shell or Texaco gas will help keep your engine clean. These 3 products have Techron in them (made by Chevron so Shell and Texaco probably can't mention this by name). Techron is also (I'm told) sold over the counter.
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#1108186 - 03/17/08 08:46 PM Re: Best Engine Cleaning Additive? [Re: cristphoto]
cosynthetics Offline


Registered: 02/27/08
Posts: 446
Loc: Mid Ohio
 Originally Posted By: cristphoto
I believe unless your car has very high mileage, simply using Chevron, Shell or Texaco gas will help keep your engine clean. These 3 products have Techron in them (made by Chevron so Shell and Texaco probably can't mention this by name). Techron is also (I'm told) sold over the counter.


These would be fuel system cleaners but not oil system cleaners.
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#1108205 - 03/17/08 08:59 PM Re: Best Engine Cleaning Additive? [Re: cosynthetics]
HighRpm Offline


Registered: 03/09/08
Posts: 34
Loc: Toledo, O hi o
what about Lube Control 20 from http://lcdinc.com/ ? (is also called LC20)

FP60 is from same company.


Edited by HighRpm (03/17/08 09:01 PM)

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#1108229 - 03/17/08 09:38 PM Re: Best Engine Cleaning Additive? [Re: ZZman]
TallPaul Offline


Registered: 10/22/03
Posts: 12915
Loc: By Detroit
 Originally Posted By: ZZman
Auto-RX, Rislone, Marvel Mystery Oil, Seafoam ,plain oil changed alot, Synthetic Oil changed alot? Any others?

A load of Redline oil for it's high ester content.

Schaeffer's Neutra 131.

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#1108232 - 03/17/08 09:42 PM Re: Best Engine Cleaning Additive? [Re: TallPaul]
cosynthetics Offline


Registered: 02/27/08
Posts: 446
Loc: Mid Ohio
Pretty much unlikely that any oil will do much cleaning.
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#1108234 - 03/17/08 09:54 PM Re: Best Engine Cleaning Additive? [Re: cosynthetics]
glennc Offline


Registered: 05/04/05
Posts: 1508
Loc: Colorado
I hate to sound like a broken record but I know that oil will clean ordinary sludge-type deposits if given a chance, based entirely on my experience with sludged-up motorcycle crankcases. Change the oil, sludge goes away.

Harder deposits I will make no claim about.

However it seems to me that one of the oil's primary jobs is to encapsulate and suspend contaminants and that it will do so whether the contaminants are formed while the oil is in the engine or were already there when it was put in.

I know in some car engines sludge will remain, but to me that is more an argument that those engines are particularly prone to keep forming new sludge than that the oil is incapable of dealing with some amount of sludge in the first place.

My humble opinion, anyway.

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#1108253 - 03/17/08 10:16 PM Re: Best Engine Cleaning Additive? [Re: glennc]
Dyoel182 Offline


Registered: 07/23/05
Posts: 1346
Loc: Texas
 Originally Posted By: glennc
I hate to sound like a broken record but I know that oil will clean ordinary sludge-type deposits if given a chance, based entirely on my experience with sludged-up motorcycle crankcases. Change the oil, sludge goes away.


Agreed. Change the oil regularly (3000 miles on a known sludger instead of trying for 5000) is the best medicine. That being said I've pulled neglected engines apart and been amazed that they looked better inside then my own engines I actually tried to take care of.

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#1108276 - 03/17/08 11:01 PM Re: Best Engine Cleaning Additive? [Re: glennc]
Cmarti Offline


Registered: 01/23/08
Posts: 438
Loc: Ohio
 Originally Posted By: glennc
I hate to sound like a broken record but I know that oil will clean ordinary sludge-type deposits if given a chance, based entirely on my experience with sludged-up motorcycle crankcases. Change the oil, sludge goes away.

Harder deposits I will make no claim about.

However it seems to me that one of the oil's primary jobs is to encapsulate and suspend contaminants and that it will do so whether the contaminants are formed while the oil is in the engine or were already there when it was put in.

I know in some car engines sludge will remain, but to me that is more an argument that those engines are particularly prone to keep forming new sludge than that the oil is incapable of dealing with some amount of sludge in the first place.

My humble opinion, anyway.


I have had similar experiences with Motorcycles, I gave credit to the HDEO, but you have observed it with PCMO. PP is now claiming in an add, that it will remove existing deposits. I wonder how true, and what is the basis for their claim.

What about ARX, if not a solvent or a detergent, makes it clean?
Esters?....could you not just run a Group V oil then? And what about all the problems with PAO's cleaning the crud of seals and
the resulting weep, wasn't that "cleaning".......I know, sooo many questions


Edited by Cmarti (03/17/08 11:03 PM)

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#1108284 - 03/17/08 11:20 PM Re: Best Engine Cleaning Additive? [Re: Cmarti]
Dyoel182 Offline


Registered: 07/23/05
Posts: 1346
Loc: Texas
Regular Penzoil also makes the cleaning claim, as well as Mobil Drive Clean which a lot of people here recommend.

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#1108291 - 03/17/08 11:45 PM Re: Best Engine Cleaning Additive? [Re: Cmarti]
mitote Offline


Registered: 01/22/08
Posts: 39
Loc: Michigan
 Originally Posted By: Cmarti
What about ARX, if not a solvent or a detergent, makes it clean?
Esters?....


Yes, esters
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#1108379 - 03/18/08 06:23 AM Re: Best Engine Cleaning Additive? [Re: Cmarti]
Pablo Offline


Registered: 10/28/02
Posts: 46691
Loc: Duvall WA - Pacific NW USA
 Originally Posted By: Cmarti


What about ARX, if not a solvent or a detergent, makes it clean?
Esters?....could you not just run a Group V oil then? And what about all the problems with PAO's cleaning the crud of seals and
the resulting weep, wasn't that "cleaning".......I know, sooo many questions


Totally different classes of esters. I do agree that oils (some better than others) will clean and carry out loose/semi baked on crud, but beyond that - it will take a long time and a lot of oil changes to clean a nasty engine and no engine oil cleans rings. AutoRx is in no way perfect, nor a miracle but the different esters in it will dissolve nasty crud, not at solvent rates, but faster than straight oil.

Not sure why the second question is limited to PAO based oils. This would happen with any oil with the correct additives and great ability to flow.

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