Engine oil flushing
Thread Starter
Seasoned Member
Joined: Aug 2009
Posts: 460
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From: Long Island NY
Year: 1989
Model: Cherokee
Engine: 4.0
Today at work myself and a few other guys were talking about different methods of flushing your engine. One likes the amsoil flush, another likes having the Wynnn's flush system, another an "old timer" says he always did the throw 2 quarts of tranny fluid in the crank case run for 15 20 minutes then drain and replace filter-new oil.
whats your method?
and cost ?
can you do it at home or take it to a shop?
whats your method?
and cost ?
can you do it at home or take it to a shop?
Junior Member
Joined: Nov 2010
Posts: 58
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From: Fallbrook,Ca.
Year: 1990
Model: Cherokee
Engine: 4.0L
what i did on myne i put diesel instead of oil,and unplugged my coil so there be no sparck,and cranked that sucker for a few seconds,did that like 5 times and just let it sit for a while then put the plug and put some 10w30 oil,ran it like that for a day and put some 15w40,shaffer syntec,and my oil is being very clean every oil change,and i do my oil changes every time i see its black.
Thread Starter
Seasoned Member
Joined: Aug 2009
Posts: 460
Likes: 2
From: Long Island NY
Year: 1989
Model: Cherokee
Engine: 4.0
CF Veteran
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Posts: 8,172
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From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Thread Starter
Seasoned Member
Joined: Aug 2009
Posts: 460
Likes: 2
From: Long Island NY
Year: 1989
Model: Cherokee
Engine: 4.0
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CF Veteran

Joined: Oct 2010
Posts: 2,150
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From: Ontario, Canada
Year: 1989 Laredo
Model: Cherokee
Engine: 4.0 L 6 Renix
Definately a good dose of snake oil. Squeeze two medium Garters out completly, and a dash of Mississauga Rattler. Run immediatly for minimum of 10 miles. Drain and Refill. That snake oil is always a cure all. Or just change your oil and filter regularly, it will clean itself up.
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Joined: Nov 2010
Posts: 5,840
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From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
Unless your engine is really gunked up, an oil flush is NOT necessary. Remove the valve cover and what you see will quickly tell the story.
If you are concerned about prior maintenance, frequent oil changes with good oil and a good filter will slowly and safely clean your engine.
BTW, I have heard of using 1 quart of ATF, but I would never use 2.
If you are concerned about prior maintenance, frequent oil changes with good oil and a good filter will slowly and safely clean your engine.
BTW, I have heard of using 1 quart of ATF, but I would never use 2.
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Joined: Oct 2010
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From: milwaukee wi.
Year: 1993
Model: Cherokee
Engine: 4.0
changing the oil but not the filter with trans fluid is doable for a couple days of driving as trans fluid is high detergent Any flush will affect sludge which may be sealing a gasket or holding pressure to a lifter your question should be whether to or not
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