Oops, thanks for the tip but the k-seal went in early this afternoon. I run the engine for about 45 minutes after pouring it in... it was idling a bit rough initially but soon settled. I let the engine cool and then drove it for about 1.5 hours and (touch wood) the coolant level hasn't dropped and it's running smoothly.Wait till its warm weather ,than drain off and refill with water and pop in the tub of K seal run it for a week or so with K seal then drain it off refill with antifreeze ..