i was able to get approx 7.5 quarts by just dropping the oil pan / filter. i have done it every 30k miles. can probably leave it in for a bit longer since the last drain came out pretty clean. cheap insurance and tranny is shifting butter smooth at 156k miles.

front diff and transfer case came out much darker with same intervals.

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2000 E53 4.4
2011 E70 35d