Folks-

I just bought a 93 300D 2.5L turbo a couple days ago. It has 74K miles and seems in good shape. I have a couple questions.

1) The plan is to run some biodiesel in this. I have read that earlier than 1994, the fuel lines might be a problem. This is a 93 - seems simple I guess, I am in for it. But - The previous owner said he has run B20 and B100 (both available locally) and I have no reason to not believe him. However, he said he hasn't had any problems with fuel lines. The fuel lines are hard and not spongy or weeping in my assessment. Question - for this car should I worry about these lines with B100?

2) Also I am freaking out over the discussions where B100 and ULSD switching is causing o-ring problems int he IP's due to their different swelling properties. All of the above concerns around the B100 and ULSD are really raining on my parade. What can I do about this seems like a catch-22. I can't rely on biodiesel all the time since it is only available in special locations and do want to run it as much as possible but need to run 100% ULSD at times I am sure.

3) If I need to replace the fuel lines, does anyone have pictures for this year and model that I can view? I think I see the tank outlet line on the right side just in front of the drive axle. If my understanding is correc this is also where my screen is located? Where does the return enter the tank? There is another line on the left side just in front of the axle that I assume is the return but it has something else next to it hanging down about 3-4 inches and feels linke a rubber end on it (like a stub line or something). Again, picts would be awesome if someone has some.

4) When I switch over to B100 which filter needs to be replaced several times typically. The plastic primary or the spin on secondary (or both?).

5) Lastly, I am uncertain about the transmission shifting in this car. It is solid (no slipping) but it seems to be very noticeable when it shifts at the lower gears. No clunking or banging but from 1-2 shifting when I am accelerating at a firm pace it sets me back in my seat. I am not sure if this is typical for this model or if I am in for a problem. The other shifts are smoother but also can be firm when I am standing on it more than normal. I can live with this if it is normal but would like to hear what other experience to determine that. The motor seems to have a slow take off from a stop but alot of power on the freeway for passing. Is this just a turbo or diesel thing?

This is obviously my first diesel car and I am excited but also completely intimidated the more I read. Thanks much for your help