I will reply to your questions soon with details... However, I will answer
questions I know off the top of my head.
My car is 1995 E300D... from factory, it already have a preheater built into
the engine. It shares coolant in the engine head. The preheater warms up the
diesel fuel before it goes to the fuel filter and injection pump
I do have factory block heater, but have yet to use it. I have zero problem
starting my car in 10 degree weather... with diesel of course.
As you know in our situation... it is not that we can't burn WVO in
winter... but how much processing we can do in the winter is the key. I
probably will have garage room this coming winter to do some filtering... as
of now, zero chance of doing so. I do all my work outside
Sourse of heater for injection line I am considering... I will answer soon
as I have to search.
As for fouled injector, I don't know... my injectors are new and I have not
converted to WVO yet. My friend's 87 300SDL has no problem as of yet. Our
WVO quest was hampered by my WVO filteration job... which is now worked out.
As for cleaning the injector, an old time MB service rep... he said one
gallon of gas in full tank of diesel will clean out the injector in no time.
We are wary of that... the safer way to do this is simply Lubro Moly Diesel
Purge... which is you disconnect both fuel lines in the engine
compartment... plug up the lines from tank so it doesn't leak out... Put the
fuel lines into a glass jar (large mayonaise jar type) and pour in two cans
of diesel purge... start up car and run it until low... don't let it suck
air... and then hook everything back up and you are done.