In a message dated 2/14/2012 8:02:23 A.M. Pacific Standard Time, dieselwesty at yahoo.com writes: The 92 Jetta calls for DOT4, so that is the big difference, it absorbes way less water the DOT 3? I know if you put DOT 3 in an MG, the rubber in the cylinders all swells, and has to be replaced! Loren