I got some thick wall viton hose from mcmaster that is working great. I'm about to buy a $200 roll and sell pre-cut kits.

The stock MB lines are defiantly NOT viton lined, and with the ULSD they seem to start leaking too quickly.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine