oil in coolant
Do your self a favor, and take it to a good mechanic who can perform a "leak down test" on your motor. I have this engine as well, great motor. The mech will fill each of your cylinders with compressed air, through a special fitting at your spark plug. then by tracking where the air leaks to(ie, up into the valve train=seals, into coolant=head gasket, into oil sump=blown rings, etc.) he'll be able to tell you what's wrong.
Best of luck to you