My '05 Sprinter (Dodge/Mercedes) turned over 272,000 miles this week, I lose about 1/3 quart between changes every 15,000 miles.

Napa (Wix) filters, Mobil 1 0W30 in winter, 5W40 in summer. Although it's only a 2.7 liter 5 cylinder, it costs just shy of $100 per oil change, as it has a 9.5 quart capacity. Worth every cent.

Synthetics rule, IMHO!