I topped mine off with Castrol 5W30, synthetic, before I went on a long drive, L.A.-PHX-Sedona-Grand Canyon-L.A... about 1500 miles. Still have 3 green service bars left. Just an awesome drive. The full nose mask kept the bugs and rocks away, too. Yup, anyways, Castrol or Mobil 1.

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2003 BMW X5 4.6is
Black on black with black wheels,
Black grille, Smoked tails, X-pipe