It sounds good and runs very smoothly, that's good .

I don't see any smoke but you shouldn't if the engine runs well and is in good shape .

I'm sure the cold exacerbates the leak .

Seriously cold weather starting drill (40* F and below) :

Depress and release accelerator pedal twice then _hold_it_to_the_floor_, temp below 40* F cycle the glow plugs _twice_ then crank the engine until it's running on all five cylinders before letting off the key .

When new you car came with a card describing this procedure, it worked very well to get my old '79 worn out low compression 617 engine to light right off in any cold .

Take that other battery and charge it gently and slowly (as low an amperage as your charger will go) for 12 ~ 24 hours before it dies from being left discharged .

Remember to always use those little battery to tray clamps ! .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better