340 Duster oil looks milky

When he fixed the cam timing he probably got coolant in the pan from when he removed the timing cover. Then never drained the oil. As a precaution make sure u check the intake and head bolts for torque. Kim
Was thinking the same thing, just figured it would of came out after changing the oil. I drained the original oil out after cam timing got changed then replaced it with this oil and ran it around 5 minutes. I guess it’s possible it was scattered throughout the engine and just didn’t get it all out with just an oil change.