Well I'm not sure. It IS for oil drain, so I'm sure its thicker/whatnot. More then anything its just oversized....5/8 silicone hose isn't exactly common. But regardless of whether its special or not - its silicone. Stinky ass silicone!
(thats how I judge silicone quality, the stinkier the better
.........seriously)
http://www.atpturbo.com/Merchant2/me..._Code=ATP-OIL1
Thats the drain hose. "hi temp silicone"