1992 Cadillac Eldorado 4.9L

1992 CADILLAC ELDORADO
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BLUEYEDCAPTAIN
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I have having to put coolant in my engine OFTEN for years now. Pressure test showed no leaks? I have been getting some 'oily gunk' on my radiator cap. Does anyone know what could be causing this?

Thanks!![img:12a26646f3]http://www.2carpros.com/forum/automotive_pictures/56243_KIF_1014_2.jpg[/img:12a26646f3]
Jan 30, 2007 at 10:47 PM
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SILVERADO5387
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it looks like oil, or maybe some really old antifreeze.
have you tried flushing your cooling system?
I've been having to add antifreeze to mine often too, I don't have any sludge yet, let me know what you find out.
Dec 30, 2008 at 4:06 PM