Header tank full of gunk - MINI Cooper Forum

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post #1 of 6 (permalink) Old Jul 12th, 2014, 02:29 PM Thread Starter
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Header tank full of gunk

Hi all, iv recently just purchased a 2003 Mini Cooper s. 6 speed man. 90 k on clocks full service history, new engine and supercharger in 2010 invoice and receipt within service history. All the usual bits tht go wrong have bin done ie power steering etc.
any way I got it back, drove spot on, kept cool, below half way, didn't get hot, I checked the water resoviour and it was full of gunk, like old coolest, but the liquid under neith it was clean, I took it to my mates garage and we flushed the system and cleaned the header tank out, I ran it for 50 miles with water, distilled, we then re flushed the system and filled it with coolest, iv done about 150 miles with no rise I'm temp and iv gone today and re checked it and it's back to a horrible dark thick substance. I don't think the head gasket has gone it's not a milky colour, iv read they have a problem with the heat exchange where it cracks and the oil will mix with the water in there, can anyone shed some light please

Much appreciated.
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post #2 of 6 (permalink) Old Jul 12th, 2014, 04:51 PM Thread Starter
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Anyone any ideas?
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post #3 of 6 (permalink) Old Jul 12th, 2014, 07:08 PM
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Hi ya

It is possible for the head gasket to go and put oil into you cooling system.

If you get the gunk between your fingers does it feel oily ? ( oil floats on water )

When I got my MCS I had loads of brown sludge in the tank it tool me a good few flushes to get rid of it I pulled the rad off and flushed it.
I also used a good cooling system cleaner to which helped
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post #4 of 6 (permalink) Old Jul 12th, 2014, 07:34 PM
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Mixing modern incompatible antifreeze mixtures can cause brown sludge, previous owners may have done this without thinking....as Marque says it may take several flushes to get rid. Then refill with the correct type recommended by BMW (and also available in Halfords - Comma G48).
Halfords | Comma G48 Antifreeze and Coolant RM 5L
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post #5 of 6 (permalink) Old Jul 12th, 2014, 08:30 PM Thread Starter
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Hey thanks for the reply I don't think the head gasket has gone as there no usual problems, loss of water, over heating etc, the sludge looks a grey colour and is quiet thick textured, iv hear the head gaskets rarely go on these but they have common issues with the oil cooler? There's no water in the oil and it doesn't seem to be using any oil, there's no smoke on startup etc,
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post #6 of 6 (permalink) Old Jul 15th, 2014, 09:11 AM Thread Starter
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Ok so does seem to use a little oil, not over heating tho and still blowing hot and cold as so the system must have water flowing round it, anyone else had this problem? Gonna give it a few moreflushes tonight and new oil fitler and oil change.
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