Brown sludge in coolent
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Joined: Aug 2018
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Brown sludge in coolent
Recently purchased a 1992 f250 with a 460. Truck runs great no steam out exhaust have flushed entire cooling system twice but still get lots of brown sludge in coolant even after adding 2 gallons of new coolant. Does seem to be a small leak at base of intake manifold. Don't think the heads are bad it seems to run great. No missing. Also seems yo be no coolant in oil
Last edited by John 509; Aug 18, 2018 at 04:48 PM. Reason: Misspell
Logistics Pro
Joined: Nov 2004
Posts: 4,795
Likes: 47
Might be a stop leak additive that the prior owner put in the coolant.
I added some to a Taurus earlier this year. Can’t recall the name of the additive but it looked like sludge in the degas bottle after it ran awhile. Worked though.
I added some to a Taurus earlier this year. Can’t recall the name of the additive but it looked like sludge in the degas bottle after it ran awhile. Worked though.
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
Are you having any cooling issues? is the sludge very noticeable?. It might just be old rust, but a proper flush should clean everything out, as in, you might want to keep flushing until there are no contaminants left in the cooling system. Asking the PO might give you some ideas too.
Oh! and welcome to FTE!.
Oh! and welcome to FTE!.
Senior User
Joined: May 2018
Posts: 118
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From: Chicago
+1 on the stop leak, i have a confirmed case of this. A truck I bought, received the truck from the buyer, brown sludge, previous owner didn't say anything about it, upon questioning him, confirmed.....just FYI
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metal13x
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