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PostPosted: Sat Nov 06, 2021 7:12 pm 
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Joined: Mon May 17, 2004 8:34 am
Posts: 3901
Location: West Dorset UK
Car Models: 96TT/900S Cabrio/9-3SW Aero/Opel GT
Made the mistake of putting "orange" anti-freeze in the Opel GT and sealing the thermostat housing with Hylomar. Bad mistake - it started leaking shortly after I started the engine today (not the first time it's been run but first prolonged run) and was burning-off on the exhaust manifold. Lots of blue-white smoke! My local car club e-magazine arrived this evening - containing an article on the pitfalls of using orange "modern" stuff in old systems - it causes sludge and also eats Hylomar! Just a little job to complete before taking it to Haynes first-Sunday event in the morning. The joys of classic car ownership!

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PostPosted: Sun Nov 07, 2021 3:00 pm 
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Joined: Tue Oct 15, 2013 6:28 pm
Posts: 1490
Location: East Fife.
Car Models: SAAB 96/MGB/Classic Twingo/Niss Figaro
Worse is to mix old ethylene glycol with the modern OAT antifreeze:- that forms a sort of gel. Very bad news.
If you accidentally do this, get the radiator off, the thermostat out, and flush the system to within an inch of its life!!!

There was a good article about this in Practical Classics last year. Can't remember which month though.

Stick with blue Ethylene Glycol, change every two years, and all will be well.


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PostPosted: Thu Nov 11, 2021 3:33 pm 
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Joined: Mon May 17, 2004 8:34 am
Posts: 3901
Location: West Dorset UK
Car Models: 96TT/900S Cabrio/9-3SW Aero/Opel GT
Also discovered that it should have a gasket [on the thermostat housing] - wasn't one when I bought it - another bodge by the previous owner's garages. Made one up but will order a couple with my next order of bits and pieces for it.

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PostPosted: Mon Nov 22, 2021 12:14 pm 
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Joined: Tue Jun 12, 2018 1:12 pm
Posts: 32
Car Models: 95
Modern red / orange antifreeze can also "eat" it's way through head gaskets fitted to older vehicles not designed for this type of antifreeze.
Decidedly not good on a 4-stroke and catastrophic for crankshaft bearings on a 2-stroke!

I've used the old-fashioned, blue glycol antifreeze from Morris Lubricants for years but it looks as if this may have been discontinued. Bluecol still do one labelled specifically for classic / vintage cars - available on Amazon.


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PostPosted: Thu Nov 25, 2021 1:57 pm 
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Joined: Mon May 17, 2004 8:34 am
Posts: 3901
Location: West Dorset UK
Car Models: 96TT/900S Cabrio/9-3SW Aero/Opel GT
Just bought a 20L container of Granville Blue A/f & coolant from my local Autobitz store. £39 with my 10% car club discount - smaller (5L) container is £18 (less discount) so I reckon I got a good deal! Now to drain and re-fill the Opel GT (currently full of plain water & garaged) with the proper stuff; it had the orange stuff put in at its last service by a local garage, who specialise in older cars so perhaps should have known better. The 96TT is filled with Evans Waterless (180) fluid - no problems there - expensive but works well.

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