Hello guys, i been noticing a problem with my antifreeze coolant tank. about a month ago when i was filling up my coolant, i notice on the top of my left over anti freeze, there was this layor of black, nasty looking oil. I took it to a mechanic and he said probably someone just dump power steering fluid in it since the power steering fluid tank was right next to it. Since i did not do it, i guess it would of been my mom, whom drives the car offend. So my mechanic just drain and wash the tank for me and check that none of it go into the system. Then last night, when i was checking the fluid level, i notice that the black oil was there again. I am starting to think that there might be a leak somewhere that is costing the oil to get in there. I cannot really differentiate the difference between engine oil, power steering fluid so i am not sure where it might be coming from. Anyone here have a clue before i take it to the mechanic again and probably end up getting a very expensive repair bill.
Thanks for any advice
Ben