As I have learned the hard way its probably a cracked head. Theres really no way you could mix in both unless theres also a head gasket problem. The other side is a cracked block. Theres a passage somewhere (either head or block) thats causing a leak.....Do a compression test. You should already have one for almost all engine diagnostics start with a compression test. Verify your holding nominal compression.
Double check your head gaskets and also check to see what your using for oil psi...You should read 20-35psi at 200rpm when warm. There could also be too much oil psi and its leaking(doubt), but also pressure test your cooling system, it should hold psi when you apply it. You'll need the tool or rent one.
__________________ 95 Mustang V6: K&N Air Filter, Flowmaster True Duals, Short Shifter, 160 Amp Alt, Optima RedTop
95 Mustang V6 -Problems-
88GT Convertable 5.0HO: B-303 Cam, Taylor Wires, MSD Dist, 3.73's, BBK Cold-Air Intake, 65mm Throttle Body, MAC Shorty Headers, Mac X-Pipe, Mac Muflers, BBk Underive Pullies
2001 Ford Focus: 6Spd SVT Gearbox, AEM Strut Bar, Steeda Clutch, Steeda Short Shifter, Volant 4" Cold-Air, EGR Eliminator, SVT Suspension, Optima RedTop, 65mm Focus Sport Throttle Body, Tuned | 
oil in water no water in oil 
