Stupid weekend, I got an 88 pickup. I drove 4 hours down to oregon, did some heavy mudding, had too much to drink, then put oil in the engine and forgot to put the oil cap back on. I drove back from the river and found oil all over the engine bay, put some oil back in and headed back up to WA. On I 5 there was some heavy traffic and my truck started screaming like the other squeeling thread that bill started. Could it be mud and oil all over the belts? I notice when I turn off the a/c it happens less, and when I turn the a/c on it starts singing. What should I do?