Is it harder on a diesel motor to leave it running or shut it off when not driving it?

Question

Is it harder on a diesel motor to leave it running or shut it off when not driving it?

Answer 1

If it's only gunna be left running a few mins between stops, just leave it running it won't hurt it and it will extend the life of the glow plugs.

Answer 2

If it is a new car, it doesn't matter. My Alfa Romeo responds well also when shut off.

Answer 3

It depends on how long.

My pickup was diesel, always shut it off.

Drove 18 wheelers, let them run most of the time.

Answer 4

Letting a diesel run goes back to the old Detroit diesel motors.  When shut off hot they would crack a head every time.  New diesels don't have those issues.

Answer 5

I gather your an american!

Turn it off! Who leaves there car running!