If you are really concerned about it put some of my viton fuel return lines on. Viton is the material of choice for biodiesel and it is cheaper than the OE stuff to boot.

I buy from fastlane whenever I can. They don't sell viton components...so I do!

http://www.fryerpower.com/store/page11.html

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.