Its probably left over. I have heard of this thing happening. If at all posible drane it and start over again but this time dont flush it just drane it and add new radiator fluid.Oil in radiator fluid?
It might just be left over. I always recommend that after you put in the new coolant change it again after a couple of hundred miles to get the rest of the oil out. If you are not leaking any oil then you know that the head is not bad. So just change out the coolant again and keep an eye on it.
it could just be residue in your coolant system
I had a 1995 Ranger, but, never had to do any major work on it.
You could have some oil residue in the cooling system. May try flushing it to see if it improve.
Also, did you replace the head bolts? Or, I guess I should ask, do they need replaced when a head removed? The reason I ask. Some vehicles today, the head bolt made to stretch when it first torqued down. The manual should tell the procedure. For example it may say torque to 90 foot pounds, then torque to 120 foot pounds. Once the head bolts have stretched and had the final torque they must be replaced the next time to do it again. But, I not sure on the Ranger and gave my repair manual away with the truck.
Normally when there coolant in the oil, it a cracked block or possible head crack. So, it may be good the oil OK.
An engine usually will run OK either way, just you have white oil or brown coolant. Friend had an old '54 chevy when we were young with a cracked block and white oil. We drove that car for three years and then went into the world to work. It still up on blocks at this old man's house and he says he cranks it up now and then.
I going to say after my short spill to try a flush first and see if it help, before suspecting any thing major and check about the head bolts.
possibly coolant -may be rust residue- if engines not overheating dont worry
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