Never added a drop of coolant to the car, never needed it. Oil, on the other hand.... I was keeping the oil companies in business! I did a lot of research looking for an answer, and the only thing I found to be even plausible was the interior (foams, vinyl, upholstery) were releasing gases and fumes, causing the film. Think "new car smell".
	
		
			
		
		
	
			
			 
				
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		