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Oil film on windshied

Heating and Ventilation

Vehicle Information: Year: 1984; Engine (size, modifications): 4.7; Total Mileage: 115,000;

I had the cam towers and oil pan resealed on my 84 928S. Since the repair, I receive a light oil film on the interior of the windshield, and after about a week, a through cleaning is required. This occurs when I use AC or heat, if I only blow fresh air, which is seldom in AZ, there is no film buildup. The garage that performed the repair tells me that the interior outgasses causing this film (really hard to believe). The heater control valve was recently replaced (leaking) and two leaks were repaired on my AC. I thought this may have been related, but the same problem exist. A glass company has checked to see that the windshield is properly sealed, and it is. I believe that the dropping of the engine to repair the leaks is somehow related to this issue. Any Ideas.

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