Rear main seal material

[TJ]

Replacing the rear main seal in my 3.8L mustang.  I have a choice of rubber, viton, or teflon.  Anyone prefer one of these over the other?  Is the preference for ease of install, longevity, etc?  Thanks 

BTW, it's a once piece seal that rides the crank flange. 

[blykins]

Any will work. 

Viton seals are nice. 

Teflon seals go on dry.  They burnish themselves into the crankshaft to seal. 

[Bolted to Floor]

From dealing in the oil and gas industry, the Viton should hold up better to the oil.

[RustyCrankshaft]

Viton. Lasts longer than rubber, more durable than teflon in a lip seal configuration.

[TJ]

Thanks to all for the info.  I'll try a viton.

I read somewhere about Teflon needing to be installed dry on a dry shaft.  I might try that someday on a seal that doesn't take so much effort to inspect.