Now, we don't pretend to be chemists, but we did stay in a
Holiday Inn Express last night soooo...
Per Wikipedia, "A fluoroelastomer is a special purpose
fluorocarbon-based synthetic rubber. It has wide chemical
resistance and superior performance, especially in high
temperature application in different media." Basically, this is
what you want when it comes to engine crankshaft seals (rear
main seals), push rod tube seals, and more. But how exactly is
it different from Viton, which is what everyone says is you
should get? Well - it's not. Viton is a DuPont brand-name for
their line of fluoroelastomers. In fact, unless the seal
manufacturer has specifically bought and licensed Viton from
DuPont, then they are actually using a fluoroelastomer from a
different rubber manufacturer.
Now, we've had lots of people who have argued that a certain
seal is or isn't viton because it is or isn't brown. In
actuality, you can get Viton and non-brand name fluoroelastomers
in black, brown, and green - the color difference is due to a
slightly different chemical additive which will change some of
it's properties but in the end they are all still excellent to
use as seals in a VW engine.
Is our info wrong?