Steam out of the exhaust . on 1996 Cadillac Seville SLS

My car has steam blowing out the exhaust at all times and i can't keep anti-freeze in it ,but I don't see it leaking on the ground .

Asked by for the 1996 Cadillac Seville SLS
You have a blown head gasket. I've used BLUE DEVIL stop leak on 3 4.6 V-8 engines and stop the leak. If you want to save alot of money email me at autoknowhow@gmail .com
I thought you couldn't use Blue Devil in Northstar engines
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