My 92 300E has a leather interior. Does anyone know if the leather is coated with a sealant or anything? I tried using Leatherique on my son's 95 BMW and it just sat on top, never soaking in to the leather at all. I was told that many newer cars have the leather sealed to prevent drying out, but when it finally does you can't do anything for it. Is my 92 MB in this camp?