White sludge in the block indicates moisture in the oil which would not be good for your car. And frying, burnt oil is never a good sign.
With the little information you provided, I'd guess that your car is in trouble.
〉 Answered on Apr 6th, 2007 by Amy Mattinat, Owner and Author at Auto Craftsmen Ltd
White sludge would indicate that coolant and oil are mixing. You may need a new intake manifold gasket or a head gasket.
〉 Answered on Apr 6th, 2007 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines