Just wanted to show some photos of what I'm (poorly!) describing. The green arrows indicate the flow of bubbles that I see. The line that enters the top of the pre-filter is very dark and discolored. In addition, it feels loose and wobbly at the thermostat end like it's not attached well there.

I'm going to the MB dealer today to order replacement lines. Anything else I should pick up while I'm there? New thermostat? Any additional O rings that I need?

Thanks again

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'98 E300 turbodiesel