You don't need to do anything at all to switch from regular oil to synthetic
(that's a complete myth).
- Bernd
-----Original Message-----
From: Don Rey [mailto:radon220@gmail.com]
Sent: Wednesday, July 02, 2008 2:27 PM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: 4.7 sludge fix
Is that also an acceptable way to switch from dino to synthetic? Or should
flushing be more thorough?
Don in CT
On 7/2/08, Bernd D. Ratsch <bernd@dodgetrucks.org> wrote:
>
> We normally remove the valve covers, remove the oil pan, and clean up
> as much as we can (using a shop vac to catch most of it). Then, drain
> the oil and fill with 50/50 oil/diesel (or Oil/ATF). Run it for no
> more than 10 minutes at low idle, drain the system, and refill with
> 5w20 and a new filter.
>
> It's not a guarantee but it does help out cleaning up the sludge.
> Once it's in the cam journals...it's just a matter of time before they
> fail and burn up the cam or shear the cam gear dowl pin.
>
> - Bernd
>
> -----Original Message-----
> From: Phillip Batson [mailto:pbatson68@yahoo.com]
> Sent: Wednesday, July 02, 2008 1:59 PM
> To: dakota-truck@dakota-truck.net
> Subject: Re: DML: 4.7 sludge fix
>
>
> My question would be, isn't there something a mechanic can do to make
> sure that sludge is cleaned out of an engine/oil journals?
> I've used synthetic the whole time, and have over 100k on mine. Maybe
> it would be worth it to have the mechanic drop the oil pan and check
> for sludge next time I have it in.
>
>
>
> ----- Original Message ----
> From: Michael Maskalans <dml@tepidcola.com>
> To: dakota-truck@dakota-truck.net
> Sent: Monday, June 30, 2008 5:07:13 PM
> Subject: DML: 4.7 sludge fix
>
>
> Thought this might be worth some discussion on The List....
>
> <http://pirate4x4.com/forum/showthread.php?t=695250>
> >
> > Amazing save on sludged up 4.7 engine with no oil pressure and 170k
> >
> > My buddies 2002 Durango SLT 4.7 liter engine with 170,000 on the
> > clock lost pressure. Valve lifters were beginning to knock, and
> > everyone thought the engine was a gone-er. He was obsessive about 3k
> > oil changes with decent quality oil at the dealer, so this engine
> > was not neglected.
> > The pan was dropped 3 months ago for an oil pump change (done by a
> > mechanic friend of his despite not being necessary at the time -
> > long story), and it had sludge in it despite oil changes. It was
> > cleaned but that means the engine musta' been full of crap at that time.
> >
> > Then I decided to try an old trick. I had him add a quart of gunk
> > oil cleanser, the kind you use during oil changes. (Years ago I woulda'
> > used
> > auto tranny fluid). Ran the engine 5 minutes, drained oil, let
> > engine sit 40 minutes to cool, reapplied cheapo oil and another can
> > of gunk oil cleaner and another 5 minutes. Then drained and inserted
> > new
> > Mobil1 oil filter and Mobil1 5w-30 oil.
> >
> > Pressure came back to normal!!! Valve lifter tapping went away!!!
> > Engine is quieter than my 2003 Durango 4.7 with 47k on the clock.
> >
> > We were both so happy we drove for a victory lap, got snacks, beers,
> > and celebrated.
> >
> > Now, does that mean the oil journals are totally clean...I doubt it.
> > Are they 20% blocked or 80% blocked with sludge?...I don't know.
> > Doom could be around the corner, but for this hour we live on! A $3k
> > engine swap is on hold! I wouldn't trust it to go coast to coast,
> > but if it survives the next thousand miles I will say it is as safe
> > as its gonna be.
> >
> > Maybe this Gunk oil treatment might help others. I hope so because
> > 170,000 miles is the usual sludge point for these sludge making
> > engines.
> > I see lotsa' posts about the 4.7 liter dying at 170,000.
> >
> > I'm not usually on this BB, but I do know cars and I do lots of
> > wrenching. This site has helped me with a couple of things, so I
> > wanted to give something back, even if it is small.
> >
> > Best,
> >
> > T
>
>
>
>
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