Engine Flush That's Not "quick"

[91Pioneer]

So I have the nice new PermaDry valve cover gasket for my 88 4.0. I want to change it soon because after a drive on the highway I can smell the oil burning off the exhaust.

 

Anywho, I have the new gasket, and I will also cut down the breather vents as per cruiser's instructions. The thing is I know that the underside of the valve cover most likely has sludge and crap built up on it.

 

Considering my truck wasn't taken all that great care of by previous owners, I was thinking that I'd put in some sort of "engine flush" and run it for maybe 100 miles or whatever prior to taking the cover off, in the hopes of cleaning up that valve cover.

 

I've seen the quick flushes where you dump it in the crankcase, then idle the engine for 15 minutes, and drain. Well I want something I can add to the engine and not have to change the oil right away. The oil is fairly fresh as it is.

 

What is a good product to add in there, and keep in there for another couple thousand miles? Yeah I know, don't overfill the engine.

[Lee21490]

So I have the nice new PermaDry valve cover gasket for my 88 4.0. I want to change it soon because after a drive on the highway I can smell the oil burning off the exhaust.

 

Anywho, I have the new gasket, and I will also cut down the breather vents as per cruiser's instructions. The thing is I know that the underside of the valve cover most likely has sludge and crap built up on it.

 

Considering my truck wasn't taken all that great care of by previous owners, I was thinking that I'd put in some sort of "engine flush" and run it for maybe 100 miles or whatever prior to taking the cover off, in the hopes of cleaning up that valve cover.

 

I've seen the quick flushes where you dump it in the crankcase, then idle the engine for 15 minutes, and drain. Well I want something I can add to the engine and not have to change the oil right away. The oil is fairly fresh as it is.

 

What is a good product to add in there, and keep in there for another couple thousand miles? Yeah I know, don't overfill the engine.

IIRC seafoam can be added to the oil & ran for a few hundred miles just fine.

[91Pioneer]

I've added Seafoam to the gas tank and used it on the vacuum line (on my car), I've never tried adding it to the oil.... hmm......

[Incommando]

http://seafoamsales.com/using-in-crankcase-oil/

 

Be sure to use a quality filter like Purolator or Wix. Oil filters are pretty important to our 4.0's.

 

[Jeep Driver]

You loosen that sludge and it makes it way to the oil pump........you won't have to worry about a new gasket.

 

Take it off and clean it.

[cruiser54]

5 quarts Rotella T3, 1 quart Marvel Mystery Oil, Wix filter. Drive it. Monitor the progress by shining a light into the oil filler hole. Safe, easy, effective. 

[yxmj]

Look at my answer (4th post down)

 

I have used this method many times on 4 liters and 2.5.....cleans it up good  :thumbsup:

 

http://comancheclub.com/topic/39604-developed-a-knock-looking-for-some-insight/

 

. :MJ 1: .

[91Pioneer]

Well I popped off my oil fill cap today to inspect. It's surprisingly clean in there, no visible sludge. Some baked on black stuff but better than I was expecting.

 

Since I had a half a can of Seafoam sitting around, I added about 1/4 of the can into the crankcase. I didn't want to put too much in there as I don't plan on changing the oil soon. Maybe once it starts getting colder I'll put more Seafoam in soon before I change it and go to 5W30 for winter.