If it ran out of oil, it was either eating or leaking oil. I would put oil
in... add Marvel Mystery oil into the glow plug holes to try to free the
piston... spray it in and let it soak.

With the glow plugs out, try to turn the engine by hand to feel if it is
really siezed or not... with diesel fuel which is oil by itself... should
not be completely siezed.... but who knows.

If you got it free, put back the glow plugs and see if you can start it up.
Worse case is you need another engine... used is the cheapest... probably
from a clunker that runs.

On Oct 3, 10:25*am, "Tiger" <tiger0... (AT) hotmail (DOT) com> wrote:
I have a '77 300D with 342,000 miles on it. Engine & trans were
replaced at around 270,000 miles. I expect that even if the low oil
casualty had not happened that you'd be due for a rebuilt engine
anyway -- possibly also a rebuilt transmission. These are really
wonderful cars and if you do this work it should be good for hundreds
of thousands more miles. It likely would also need painting. When you
do this, be sure that all the windows, rubber gaskets & trim is first
removed and then the gaskets replaced with new (new gaskets = a few
hundred $$). Mine was repainted, but it was a spray-over. Now the
gaskets are leaking around the windshield when I drive on the highway
in rain. Also, I have a two spots of rust beginning from below the
gaskets. Evaluate the body for rust. Consider if you want to make a
long-term commitment. If you do and stick with it -- correcting the
issues that will crop up -- you'll have a great car for much less than
a new one -- which wouldn't have the same durability and quality. They
don't make them like they used to!

Peter Hollings