I've been using Viton on all my diesels for the past 2 years.

I was changing the OE injector lines on my TDI regularly because they kept weeping and eventually melting. B100 everywhere!

Switched to Viton and no more problems at all. I've never had to replace them in over 2 years and the lines are still flexible. The OE lines were stiff within a week of installation.

I was so happy I changed the 300D and 300TD over to Viton too.

JWJ

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JWJ
1983 MB 300D - > 430,000 miles - Deep Blue - Bilstein Comforts - 0-60 in 24 seconds - 27MPG
1985 MB 300TD (wagon) - > 275,000 miles - Manila Beige - Thule rack - 0-60 in 18 seconds - 22 - 25MPG
Biodiesel, Mobil Delvac 1, and Viton fuel lines!