I run GC 0W-30 in my 1995 BMW 325iC...work perfectly, IMHO.
I'd also consider:
-Redline 5W-40 or 10W-40,
-Eneos 5W-40,
-Elf 0W-30,
-Mobil 1 Turbo Diesel Truck 5W-40 [Delvac 1],
-Valvoline Synpower 5W-40,
-Castrol Syntec 5W-40,
-Shell Rotella Synthetic 5W-40,
=Amsoil 5W-40