I replaced all of the o-rings with viton just in case I ever have the opportunity to run bio. I like bio for it's lubricity and earth friendliness but the car gets awful mileage running it so, unless you're making it yourself, it's not economical.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250