best engine flush

BadS15v8 · 10-28-2009, 11:06 PM

Well i decided today with my truck reaching 250k it was time for a engine oil flush and a good crank case cleanin.

whats the best thing to use to clean and flush all the high mileage gunk from the ole s-10? i wanna find something to use that'll get all the sludge so when i take a valve cover off she's looks new again under there

mrmontebuilder · 10-28-2009, 11:44 PM

I would not do that if I were you - last time I used engine flush I flushed the engine down the toilet. I did flush and then changed oil and it ran about 10 minutes and oil light came on and that was it. I assume it broke some deposits loose and it got into the oil pump. I am not the first to have that happen either, most flush is basically kerosene and think about how thin 5w30 is to start and then thin it down by adding a quart of kerosene to it and imagine how that will be on your internals.

BadS15v8 · 10-29-2009, 11:43 AM

I've used kerosene on the last two jeep I had and ran rotella after flushing and never had any problems. I was just checkin to see what all different types of chemicals people on the forum have used

SpiderDallas · 10-29-2009, 11:52 AM

I have used the gunk engine flush before but not on my blazer. I used it on my 2g eclipse.

97s104x4 · 10-29-2009, 11:53 AM

seafoam...

992drjimmy · 10-29-2009, 12:44 PM

An experienced old time mechanic told me years ago to run a half to one quart of type f tranny fluid in the old for a week. Then change it. Ive done that quite few times. Oil sure gets dirty in the fewdays to aweek.

Davemutt · 10-29-2009, 12:46 PM

Quote: Originally Posted by mrmontebuilder

I would not do that if I were you - last time I used engine flush I flushed the engine down the toilet. I did flush and then changed oil and it ran about 10 minutes and oil light came on and that was it. I assume it broke some deposits loose and it got into the oil pump. I am not the first to have that happen either, most flush is basically kerosene and think about how thin 5w30 is to start and then thin it down by adding a quart of kerosene to it and imagine how that will be on your internals.

X2. Worst case scenario, but not at all unlikely. Even if you don't wreck your engine, you'll probably develop a lot of leaks.

BadS15v8 · 10-29-2009, 05:12 PM

Seafoam and tranny fluid I've both heard of. I just dnt se tranny fluid cuttin through built up gunk like i want it too. Prob go with the seafoam

theprodigy001 · 10-29-2009, 07:39 PM

i have 219k on my 88s-15 jimmy 4.3l and i used sea foam for my fuel system and auto-rx in my crank case a few months ago.works great

MTchevyS10 · 11-04-2009, 10:36 PM

I can get a hold of some if you want to give it a try.
You're welcome to try it out at my cost, as long as you let me know what you think afterward!

I think the recommendation is to run it in the vehicle at moderate to low(er) idle for 10 mins, then dump the oil.
As an alternative (or in combination with a light engine flush use), you can try an oil that has more detergent additives and you may get a cleaner motor gradually as you reach consecutive OCIs.

01x.joyride · 11-04-2009, 11:19 PM

ive been told to use automatic tranny fluid and run it for 5-10 mins idling right before an oil change...

dimerunner88 · 11-04-2009, 11:42 PM

i just use a high quality oil (synthetic) and change it when it gets black after about a month then put some new synthetic in it and run it for 3k mobil 1 is good about cleaning things out without damaging anything.

K-Slice · 11-05-2009, 10:59 PM

Seafoam is the BEST all around engine cleaner you can buy. I would say it's comparable to a BG flush in the job it does.
I put it in the oil, go for a short drive then change it. Afterwards there is a big difference. I do it in my Firebird every spring when I bring her out, then about mid summer again. Plus have run it through the crankcase of many friends and family cars.

mblack · 11-06-2009, 05:05 PM

Quote: Originally Posted by mrmontebuilder

I would not do that if I were you - last time I used engine flush I flushed the engine down the toilet. I did flush and then changed oil and it ran about 10 minutes and oil light came on and that was it. I assume it broke some deposits loose and it got into the oil pump. I am not the first to have that happen either, most flush is basically kerosene and think about how thin 5w30 is to start and then thin it down by adding a quart of kerosene to it and imagine how that will be on your internals.

Ditto. It it really is that boogered up, then running a solvent like kerosene through it is just going to cause problems. A gradual approach would probably be best. A little ATF would work or my dad used to swear by CD-2 detergent http://automotive.neebo.org/cd-2-oil-detergent-15-oz. His engines always seemed to last forever and never had any sludge. Just use it for every oil change and you'll be all cleaned up before you know it.

10-28-2009, 11:06 PM	#1
BadS15v8 Registered User Age: 23 Join Date: Aug 2005 Posts: 1,126 Location: User is: OffLine	best engine flush Well i decided today with my truck reaching 250k it was time for a engine oil flush and a good crank case cleanin. whats the best thing to use to clean and flush all the high mileage gunk from the ole s-10? i wanna find something to use that'll get all the sludge so when i take a valve cover off she's looks new again under there
	[Reply w/Quote]

10-28-2009, 11:44 PM	#2
mrmontebuilder Registered User Age: 39 Join Date: May 2009 Posts: 140 Location: User is: OffLine	Re: best engine flush I would not do that if I were you - last time I used engine flush I flushed the engine down the toilet. I did flush and then changed oil and it ran about 10 minutes and oil light came on and that was it. I assume it broke some deposits loose and it got into the oil pump. I am not the first to have that happen either, most flush is basically kerosene and think about how thin 5w30 is to start and then thin it down by adding a quart of kerosene to it and imagine how that will be on your internals.
	[Reply w/Quote]

10-29-2009, 11:43 AM	#3
BadS15v8 Registered User Age: 23 Join Date: Aug 2005 Posts: 1,126 Location: User is: OffLine	Re: best engine flush I've used kerosene on the last two jeep I had and ran rotella after flushing and never had any problems. I was just checkin to see what all different types of chemicals people on the forum have used
	[Reply w/Quote]

10-29-2009, 11:52 AM	#4
SpiderDallas Registered User Age: 27 Join Date: Oct 2009 Posts: 269 Location: Dallas,TX User is: OffLine	Re: best engine flush I have used the gunk engine flush before but not on my blazer. I used it on my 2g eclipse.
	[Reply w/Quote]

10-29-2009, 11:53 AM	#5
97s104x4 Newb Age: 18 Join Date: Aug 2009 Posts: 390 Location: Ephrata, PA User is: OffLine	Re: best engine flush seafoam...
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10-29-2009, 12:44 PM	#6
992drjimmy Registered User Age: 38 Join Date: Sep 2005 Posts: 1,247 Location: Decatur INDIANA User is: OffLine	Re: best engine flush An experienced old time mechanic told me years ago to run a half to one quart of type f tranny fluid in the old for a week. Then change it. Ive done that quite few times. Oil sure gets dirty in the fewdays to aweek.
	[Reply w/Quote]

10-29-2009, 12:46 PM	#7
Davemutt Registered User Join Date: Aug 2004 Posts: 31 Location: User is: OffLine	Re: best engine flush Quote: Originally Posted by mrmontebuilder I would not do that if I were you - last time I used engine flush I flushed the engine down the toilet. I did flush and then changed oil and it ran about 10 minutes and oil light came on and that was it. I assume it broke some deposits loose and it got into the oil pump. I am not the first to have that happen either, most flush is basically kerosene and think about how thin 5w30 is to start and then thin it down by adding a quart of kerosene to it and imagine how that will be on your internals. X2. Worst case scenario, but not at all unlikely. Even if you don't wreck your engine, you'll probably develop a lot of leaks.
	[Reply w/Quote]

10-29-2009, 05:12 PM	#8
BadS15v8 Registered User Age: 23 Join Date: Aug 2005 Posts: 1,126 Location: User is: OffLine	Re: best engine flush Seafoam and tranny fluid I've both heard of. I just dnt se tranny fluid cuttin through built up gunk like i want it too. Prob go with the seafoam
	[Reply w/Quote]

10-29-2009, 07:39 PM	#9
theprodigy001 Registered User Join Date: Oct 2009 Posts: 19 Location: User is: OffLine	Re: best engine flush i have 219k on my 88s-15 jimmy 4.3l and i used sea foam for my fuel system and auto-rx in my crank case a few months ago.works great
	[Reply w/Quote]

11-04-2009, 10:36 PM	#10
MTchevyS10 Registered User Join Date: Jan 2008 Posts: 815 Location: User is: OffLine	Re: best engine flush I can get a hold of some if you want to give it a try. You're welcome to try it out at my cost, as long as you let me know what you think afterward! I think the recommendation is to run it in the vehicle at moderate to low(er) idle for 10 mins, then dump the oil. As an alternative (or in combination with a light engine flush use), you can try an oil that has more detergent additives and you may get a cleaner motor gradually as you reach consecutive OCIs. Last edited by MTchevyS10 : 11-04-2009 at 10:39 PM.
	[Reply w/Quote]

11-04-2009, 11:19 PM	#11
01x.joyride stupid regular cab!! Age: 26 Join Date: Oct 2005 Posts: 1,474 Location: tacoma,wa User is: OffLine	Re: best engine flush ive been told to use automatic tranny fluid and run it for 5-10 mins idling right before an oil change...
	[Reply w/Quote]

11-04-2009, 11:42 PM	#12
dimerunner88 whore turned lurker Age: 23 Join Date: Jan 2007 Posts: 20,242 Location: Clay City,IN User is: OffLine	Re: best engine flush i just use a high quality oil (synthetic) and change it when it gets black after about a month then put some new synthetic in it and run it for 3k mobil 1 is good about cleaning things out without damaging anything.
	[Reply w/Quote]

11-05-2009, 10:59 PM	#13
K-Slice Registered User Age: 20 Join Date: Nov 2009 Posts: 33 Location: Traverse City, MI User is: OffLine	Re: best engine flush Seafoam is the BEST all around engine cleaner you can buy. I would say it's comparable to a BG flush in the job it does. I put it in the oil, go for a short drive then change it. Afterwards there is a big difference. I do it in my Firebird every spring when I bring her out, then about mid summer again. Plus have run it through the crankcase of many friends and family cars.
	[Reply w/Quote]

11-06-2009, 05:05 PM	#14
mblack Registered User Age: 38 Join Date: Dec 2007 Posts: 28 Location: Queen Creek, AZ User is: OffLine	Re: best engine flush Quote: Originally Posted by mrmontebuilder I would not do that if I were you - last time I used engine flush I flushed the engine down the toilet. I did flush and then changed oil and it ran about 10 minutes and oil light came on and that was it. I assume it broke some deposits loose and it got into the oil pump. I am not the first to have that happen either, most flush is basically kerosene and think about how thin 5w30 is to start and then thin it down by adding a quart of kerosene to it and imagine how that will be on your internals. Ditto. It it really is that boogered up, then running a solvent like kerosene through it is just going to cause problems. A gradual approach would probably be best. A little ATF would work or my dad used to swear by CD-2 detergent http://automotive.neebo.org/cd-2-oil-detergent-15-oz. His engines always seemed to last forever and never had any sludge. Just use it for every oil change and you'll be all cleaned up before you know it.
	[Reply w/Quote]