Hello, My son purchased a 2001 S60. After replacing the clutch we started it and after warming up there was a lot of smoke coming out of the exhaust. This only happens after warming up. It is the non-turbo model. The compression in all cylinders are between 140 to 150 psi. So, I don't think that it can be the head gasket. Where can coolant get into or enter the intake prior to combustion? I am quite perplexed.