coolant leak?
 

I blew the old S4 motor so i put in a used S5 motor my buddy had with all the S4 manifolds , turbo, lines everything. The car started right up but i noticed its building up coolant in that little valley that forms were the lower intake manifold meets the motor. could this be because i used the old LIM gasket? or is this something worse. I havent driven the car yet because i dont want to cause any damage to this motor but it does start fine so can any one help me out with some info?

either old LIM gasket or old coolant passage o-rings. I say o-rings myself.

to raplace the coolant passage O rings do i only have to take of the LIM