I have been running the same 240d from 140,000 to 230,000 miles, most of that on veggie oil. When I first got the car, I would mix my filtered oil in the original fuel tank (summer only). After a few years of tinkering I run two tank and still going very strong. Good compression, starts right up in winter.

I have good things to say about the plant drive products particularly the heated VM2 coolant heated filter. I use their vegtherm 12v inline fuel heater mounted on the injection rails as the last thing before the fuel goes to the IP (with proper fuel injection line).

I use a Arctic fox brand hot fox in-tank coolant heated pickup which is mounted along the bottom of my 14 gallon aluminum boat tank.

My most important recommendation is to NOT follow the fuel routing for greasecar, plant drive and some other plans. They use two valves (One to select which tank and filter for the lift pump to PULL from, and the other to select which tank to return to.)

I and a lot of other people use THREE 3 port valves, one before and one after the lift pump and one for fuel return. Valve 1 chooses which tank (and pre filter) for the the lift pump to PULL through. Valve 2 chooses which filter the lift pump will PUSH through. Valve 3 picks which tank to return to. If you route it this way, you won't end up sucking up air when the lift pump tries to pull thick oil through the main VO filter. Pushing, not pulling is the way mercedes designed their lift pump to work. In fact, do all pumps work better pushing through a filter than pulling? I know the stock 616 lift pump does! I've never sucked air after changing to this set up.

If you want to save money and space on valves, you can use a 6 port plastic pollak valve to route fuel before and after the lift pump

Other recomendations: Purge your engine of VO before shutting down! Ream your glow plugs holes when you change them. Do a diesel purge every year. Consider rebuilding with monarch injector tips if they ever start clicking a lot or clogging. I clogged an injector after 5 years of wvo. On a 240d miles from home and down an injector, is a rough ride! This is why you purge!