Originally Posted by biopete

Theres no definitive answer. All parts are subject to wear and tear. Any parts from lift pump , to IP , to injectors I assume get more wear and tear due to using VO. How much extra wear and tear depends on quality of VO. How much wear and tear can they take is still to be determined. Hopefully i'll keep a car long enough to find out. My friends 240D has like 330,000 miles on it and has been running wvo since about 200,000 miles .

Everything layback said are things to look out for. But you can prevent any major damage simply by:

1) Making sure glow plugs are good.
2) Making sure injectors are good. Replacing and checking as necessary.
3) Oil changes at 5,000 miles prevents oil contamination so you can easily prevent crank seizure. (Many have have posted oil analysis results saying the engine wear and oil are good at this interval.)
4) Last but not least, use good , water free oil. (really should be a given)

Personally, i do Fuel filter changes every 5,000 miles or so because they clog by that time. Others get more miles. At 10.00 a filter not bad.

I've never seen a lift pump fail on an MB.

The veg kits usually come with a big fuel line 10MM or 11MM id from elsbett for the VO. You put that from tank to IP. No fuel line clogging problems.

The fuel tank can get funky with WVO in it. But that is cleanable. I've never seen a wvo tank strainer clog. However, I have had two benzes with diesel fuel that sat a long time with terribly clogged strainers.

The biggest problem i expect with WVO use (single tank especcially), given the fact I'm watching out and preventing any engine damage by doing things mentioned above, is the IP. I have a friend with 1987 603 who had to replace his IP after about 50,000 miles or so running single tank wvo. He did'nt even heat it at first . I think he just blended it. Then he added a glow plug heater. He never replaced relay with afterglow relay or replaced his injectors. So i'm thinking I should get 100,000 out of my IP with my single tank elsbett system.