Using BMW spec full synth 5w30....it's spot on the mark (exactly half way between the marks) as the oil was changed about 500 miles ago. Have you ever done a "hot" oil change and used 1/2 quart of ATF fluid, got it to temp...then drove 100 miles...and then did another change back to full 5w30 synth? Some folks swear it cleans the oil journals and gets any varnish out. I'm reticent but willing as long as I don't kill my X. LOL.

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2003 E53 4.6is, titanium silver, black Nappa interior