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  #1  
Old 01-25-2009, 01:41 PM
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Engine defunking products pre- oil change?

I've been eyeballing the oil purge products at my local parts store. They claim that you pour it in before you change your oil and run the engine for a couple mins, then change your oil and it removes deposits and sludge. I like the idea behind it, but at the same time I am probably running old gaskets.. What are your opinions?

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  #2  
Old 01-25-2009, 01:45 PM
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There is no such thing as a "defunking" product.

There are products that will compromise the ability of the oil to maintain a separation between steel parts and cause undue wear in the engine for the period that the product is in the engine.

Are you referring to those products?
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  #3  
Old 01-25-2009, 01:47 PM
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Quote:
Originally Posted by nickofoxford View Post
I've been eyeballing the oil purge products at my local parts store. They claim that you pour it in before you change your oil and run the engine for a couple mins, then change your oil and it removes deposits and sludge. I like the idea behind it, but at the same time I am probably running old gaskets.. What are your opinions?
Don't do it, in older engines the gunk/sludge, whatever you want to call it, maintain (fill in) clearances that affect compression and oil pressure.
My neighbor had an old diesel tractor, ran fine...until he used some motor clean stuff prior to an oil change. Result: very low oil pressure and reduced cylinder compression, in fact now it barely starts with ether.
I believe the old gaskets would be the least of your problems after a "treatment".
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Old 01-25-2009, 01:49 PM
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Yes something like that, it is just used for a couple minutes before you dump it and your dead oil out and renew it. I attached a picture of the stuff Gunk makes.
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Engine defunking products pre- oil change?-lg_mf3.jpg  
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  #5  
Old 01-25-2009, 01:50 PM
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Originally Posted by CANDIDE View Post
Don't do it, in older engines the gunk/sludge, whatever you want to call it, maintain (fill in) clearances that affect compression and oil pressure.
My neighbor had an old diesel tractor, ran fine...until he used some motor clean stuff prior to an oil change. Result: very low oil pressure and reduced cylinder compression, in fact now it barely starts with ether.
I believe the old gaskets would be the least of your problems after a "treatment".

Cool thanks for the heads up, I do like the idea of a clean engine but it's not worth redoing all the gaskets and gleaning the oil pump screen 8 times.
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Old 01-25-2009, 02:01 PM
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Most people agree that regular use of Mobil's synthetic oil will clean the engine's internals safely. Engine cleaners are usually solvents and as Brian posted, not a good lubricant nor lubricant additive.
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  #7  
Old 01-25-2009, 02:22 PM
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Most people agree that regular use of Mobil's synthetic oil will clean the engine's internals safely.
Yep.

Just think about it; if the solvent is strong enough to remove sludge, what will it do to the good lubricating surfaces? Even if you do a short oil change, you won't get all of it from the sump and it will continue to do damage.
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Old 01-25-2009, 03:15 PM
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Exclamation What Brian Said !!

All you needs do is a few HOT oil & filter changes with Synthetic oils and all the crud will be gone ~ no B.S. , I've cleaned out horribly sludged up engines everyone in the shop looked at and said " that's JUNK Nate ! " . they're still running years later .

Even if you use Dino based oil (please don't) simply keeping a tight oil change regimine and always changing it when it's blistering hot will also clean out accumulated crud , even old parrafin sludge .
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Old 01-25-2009, 03:37 PM
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If diesel rated oil has been used your probably not going to have much sludge in there anyway. FWIW Ive seen the inside of a few high mileage 616 engines and none had hardly any sludge. your engine at 160K is still an infant
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  #10  
Old 01-25-2009, 04:57 PM
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Quote:
Originally Posted by babymog View Post
Most people agree that regular use of Mobil's synthetic oil will clean the engine's internals safely. Engine cleaners are usually solvents and as Brian posted, not a good lubricant nor lubricant additive.

Yes, indeed. I have run M1 in engines with 200,000+ miles and after a few oil changes they look brand new inside.

As was said before, change it HOT take the car on a good long run and change the oil immediately. It should be too hot to touch.
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  #11  
Old 01-25-2009, 07:34 PM
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The old guys used to remove a quart and then dump in a quart of Diesel fuel and run it just up to hot temperature and let it hot drain. Not sure it did any good or harm but they did it. Seems likely fairly safe? Not running it more than just up to temperature though. I like the Synthetic oil idea better myself. Even if you don' t normally run synthetic is makes a decent solvent. But then again... so does Diesel fuel.
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  #12  
Old 01-25-2009, 07:38 PM
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Seems likely fairly safe?
Nope.
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  #13  
Old 01-25-2009, 08:10 PM
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Exclamation Flushing Agents

Diesel fuel destroys the lubricity of engine oil .

ATF was also used in the olden days but simply using Synthetic oils will clean out any engine without worrying about scuffing the cam lobes nor " wiping " the plain bearings .
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  #14  
Old 01-25-2009, 08:12 PM
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My CAT manual shows how to tell if the engine was run with oil contaminated with diesel fuel: the bearings are black = replace bearings.
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  #15  
Old 01-25-2009, 08:24 PM
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Originally Posted by vwnate1 View Post
ATF was also used in the olden days
I still do that in my Motor Home......454.

I ran several of the older Fords and Chevys substituting
a qt of ATF in the crank case all the time.
Many of those engines went over 200k. Not bad for
an american gasser

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