WARNING: eng crankcase flush
Thread Starter
Le Mans Master
Joined: Oct 2000
Posts: 6,209
Likes: 33
From: Texas-out west
WARNING: eng crankcase flush
Warning: SERVICE BULLETIN NO> 02-06-01-02B
Date: Aug 2002
Subj: Engine Crankcase Flush
Models: 2003 and prior GM Cars and Trucks
General Motoreds is aware that some companies are marketing tools and equipment to support engine crankcase flush procedures. GM does NOT endorse or recommend crankcase flushing for any of its gasoline engines. Analysis of some of the materials used for crankcase flushing procedures indicate incompatibility with GM engine components and the potential for damage to some engine seals and bearings. Damage to engine components
resultsing from crankcase flushing procedures is NOT covered under the terms of the New Vehicle Warranty.----This is taken from the new Corvette Restorer published by NCRS. :eek:
Date: Aug 2002
Subj: Engine Crankcase Flush
Models: 2003 and prior GM Cars and Trucks
General Motoreds is aware that some companies are marketing tools and equipment to support engine crankcase flush procedures. GM does NOT endorse or recommend crankcase flushing for any of its gasoline engines. Analysis of some of the materials used for crankcase flushing procedures indicate incompatibility with GM engine components and the potential for damage to some engine seals and bearings. Damage to engine components
resultsing from crankcase flushing procedures is NOT covered under the terms of the New Vehicle Warranty.----This is taken from the new Corvette Restorer published by NCRS. :eek:
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Re: WARNING: eng crankcase flush (Desertdawg)
I'd NEVER do that unless you are trying to clean out an engine that has suffered from many years of neglect and abuse. NEVER .. Same goes for fuel system cleaners... I have a 3.1 mini-van that has 180K and has never had any additives, flushes or FI cleaners ever and it runs like new. Snake oil. :bs (it has all of the original fuel system parts and has never been apart excepet for a water pump)
[Modified by silvervetteman, 6:11 AM 1/16/2003]
[Modified by silvervetteman, 6:11 AM 1/16/2003]
Le Mans Master
Joined: Aug 2001
Posts: 8,164
Likes: 0
From: ohio
Re: WARNING: eng crankcase flush (LT1driver)
you should never have to flush the crankcase if you change the oil regularly anyway. The closest i've ever come to flushing it was draining the oil, adding about 3-5 quarts, let it run for about 20 minutes then change the oil& filter.
Le Mans Master
Joined: Nov 1999
Posts: 5,768
Likes: 3
From: San Diego CA
Re: WARNING: eng crankcase flush (LT1driver)
Warning: SERVICE BULLETIN NO> 02-06-01-02B
Date: Aug 2002
Subj: Engine Crankcase Flush
Models: 2003 and prior GM Cars and Trucks
Date: Aug 2002
Subj: Engine Crankcase Flush
Models: 2003 and prior GM Cars and Trucks
IMO the answer is NO, NEVER IN A MILLION YEARS. A crankcase flush with the chemicals they are talking about is tantamount to begging for engine failure. The concept of Washing the oil film out of my crankcase while the engine is running is idiotic.
Furthermore, the idea of constantly pumping fresh oil into the engine until it all comes out clear is just being a wastrel.
Change your oil & filter at regular intervals, and stay away form the cost adders that so many places try to push on you. Jiffy Lube is now owned by the same company that produces slick 50 and so now they flog that stuff on you at every oil change. I even got into a long heated discussion with the manager of the Jiffy Lube I use about that stuff, and boy the propaganda has sold him over - he's convinced this stuff is the second coming.
Melting Slicks
Joined: Apr 2002
Posts: 2,103
Likes: 0
From: Tucson AZ
Re: WARNING: eng crankcase flush (RJR99SS)
you should never have to flush the crankcase if you change the oil regularly anyway. The closest i've ever come to flushing it was draining the oil, adding about 3-5 quarts, let it run for about 20 minutes then change the oil& filter.
Team Owner
Joined: Jul 1999
Posts: 26,545
Likes: 46
From: Huntersville NC
but the informercials say it is good for my engine!
But how can that be? I watched an hour long show on TV the other night (it was very late at night) and all they talked about was how great this stuff is for my engine!!! :rolleyes: :rolleyes: :rolleyes: MJ
Melting Slicks
Joined: May 2002
Posts: 2,508
Likes: 0
From: Wisconsin
Re: WARNING: eng crankcase flush (silvervetteman)
[QUOTE]I have a 3.1 mini-van that has 180K QUOTE]
Is it a Lumina APV? My dad has two of those running and one crashed. He's gotten the power up to 165hp with timing advance and 2.5inch straight exhaust! My dad is a nut! Good vans though.
Is it a Lumina APV? My dad has two of those running and one crashed. He's gotten the power up to 165hp with timing advance and 2.5inch straight exhaust! My dad is a nut! Good vans though.
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Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
Re: but the informercials say it is good for my engine! (MNJack)
But how can that be? I watched an hour long show on TV the other night (it was very late at night) and all they talked about was how great this stuff is for my engine!!! :rolleyes: :rolleyes: :rolleyes: MJ
People have seen advertisements that show sludge in the bottom of oil pans. Big deal I say. If regular oil changes can't dislodge that stuff, who cares? It ain't gonna hurt nothing!
Just tell people that modern motor oils contain detergents -- which already do the job if the oil is changed regularly. So there.
Team Owner
Joined: Aug 2000
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From: Massillon,Ohio USA
2020 C3 of the Year Finalist - Unmodified
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St. Jude Donor '08-'09-'10-'11-'12
Re: but the informercials say it is good for my engine! (page62)
I don't know about "today's" engines, but when I was 16-22yrs old we used to put a quart of kerosene in the engine while warm 10 minutes while running before changing the oil and let it drain real well. I did this mainly(I don't today)to a 1966 Chevelle Malibu with a 283 2bbl/Powerglide and sold it with 322,000mi and the engine was quiet as a mouse. I change my oil in my Corvettes often enough(about twice a summer on each one)that I don't worry about flushing. The only flushing I do now is in my bathroom. :lol:
Also, owned a 1986 Ford Ranger V6 until 1998 and traded it in with 189,000mi, changed oil and filter religiously every 4,000mi and NEVER EVER flushed the engine. I believe it soley(as someone else also mentioned)depends on how well you maintain your oil and filter.
Also, owned a 1986 Ford Ranger V6 until 1998 and traded it in with 189,000mi, changed oil and filter religiously every 4,000mi and NEVER EVER flushed the engine. I believe it soley(as someone else also mentioned)depends on how well you maintain your oil and filter.
Race Director
Joined: Nov 2000
Posts: 16,416
Likes: 1
From: NC,USA
Re: WARNING: eng crankcase flush (LT1driver)
All that i have ever fooled around with is running ATF for a week... never getting on it, or going above 4k rpm. Run her till its dark brown, switch back over to oil... but thats to clean out the lifters.
works like a charm... has enough lube property's to keep everything together. And tons of additives. Ever pulled apart an auto tranny... spotless unless its been beat to death :cheers:
works like a charm... has enough lube property's to keep everything together. And tons of additives. Ever pulled apart an auto tranny... spotless unless its been beat to death :cheers:
Thread Starter
Le Mans Master
Joined: Oct 2000
Posts: 6,209
Likes: 33
From: Texas-out west
Re: WARNING: eng crankcase flush (ZD75blue)
Good info for the non-auto types. I have a 83 Supra that is run very very hard and has 306,000 on it, regular oil/filter changes, never any fuel or oil additives and runs good except the exciter box failed on it(electrical). Proof is in the pudding as they say. Sucker born every minute is why snaaake oil sells. :lol: :lol: :cheers:
