Club 80-90 Forums

Our son has poured the remains of a bottle (poss 2 pints?) of blue anti freeze into his Subaru Legacy which had pink stuff in it. The blue stuff was most likely Halfords from around 5-10 years ago and has been sitting in our garage ever since..

Is a total core meltdown just around the corner? I don't mind him ruining the rest of his car but that 3 litre flat six needs to be preserved for obvious reasons.

It'll forma a nasty gunge...I've done it myself by mistake previously, best to have it flushed and fresh G13 put in.

Ta, any idea how long the sludge takes to form....is flushing a 'do it over the weekend' job or something that can be left awhile?

It reacts pretty quickly. Makes a nasty sticky brown tar which needs a strong solvent to remove (petrol doesnt really work, brake cleaner is probably better)

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I’m not sure if this will help but if it reacts to produce a gel-like sludge then you might be able to ‘back it up’ out of narrow passages by removing the pipes and running a water flow from a hose backwards through your heat exchangers and other areas where pipe diameters narrow.

I’ve seen it done with debris and rust using a ‘flush’ agent that was poured into the coolant beforehand but I don’t know what that would do about coolant admixes. Sorry.


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Yesterday i mixed half a litre of g13 and bluecol i have had for years

Still fully fluid and a nice purple shade 24 hours later

You sure about the gel forming ?

Cobra88 wrote:Yesterday i mixed half a litre of g13 and bluecol i have had for years

Still fully fluid and a nice purple shade 24 hours later

You sure about the gel forming ?

Mabey it needs heat to react?

Regards Gary

Cobra88 wrote:Yesterday i mixed half a litre of g13 and bluecol i have had for years

Still fully fluid and a nice purple shade 24 hours later

You sure about the gel forming ?

It was only the original OAT antifreezes that reacted, modern versions are mixable but it's not desirable.