B100 compatible hose is good to use if you are willing to spend the money. The stock rubber works just fine. Rubber hose has a service life regardless of the fuel type you choose. The stuff needs to be replaced anyway. Just replace it and move on.

Does anyone use a special additive to avoid valve adjustment? No, its normal maintenance, you adjust the valves. Brakes, tires, filters, ....rubber hoses.... its all considered a wear item.

And you guys in the pissing contest, can you take it offline? Really, just get out the rulers, see whose is the biggest and lets move on.

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83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.