I have read that glow plugs are a 50,000 mile item but can't guarantee that. Call it the same as spark plugs.

If your diesel is cheaper than gasoline that's great. Is that the summer or winter price?

Changing filters is the same as the gasoline version.

You need an LL-04 oil.

If you are leaving the vehicle stored you can use special diesel fuel stabilizers in the tank.

Don't overthink it.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue