I apologize if this has already been discussed and answered, but is there any risk in filling the tank with B20 diesel, in an older Mercedes, (like an '84 300SD)? Are there rubber gaskets and hoses at risk of an early breakdown?

I filled up for the first time yesterday (Shell at Twelfth and Vine in Philadelphia $2.89) and my SDS seems to love it so far. The idle is smoother and the exhaust smells better too. The thought of instantly reducing petroleum dependency by 20% is a strong motivation.

Do I need to change any hoses and parts? I will keep an eye on the fuel filters. Thanks in advance!

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2001 E320 4MATIC WAGON desert silver/tan, 169K
1986 300SDL black on black, 240K

1984 300 SDS (stick-shift) 209K.....now reborn as a 1983 300SD (stick-shift facsimile of the former 84) 274K

1982 240D (sold!) 264K