In Reply to: 5W30 Mobil 1 NOT spec'ed for engine posted by MikeW on November 23, 1999 at 10:27:27:
My '00 328i manual (p. 124) for temp range of -20 to +90 F, use Long Life Oil of 0W-X or 5W-X viscosity. Where X is 30, 40, or 50.
The BMWUSA website says Mobil 1 synthetic is also okay.
So I suppose Mobil 1 5W-30 is fine for the E46.