I'm looking to buy a new radiator for my 99 seville STS, and there shows to be 2 types of radiators. One with Engine Oil Cooling, and one with Transmission only. I looked at my old radiator and I see the transmission lines coming from the radiator on the driver side, but on the passenger side there seems to be something else. It looks like a hose and not a line coming from the lower part of the radiator. Could that thin hose be an oil line?