And 7500 vs 3500 mile service intervals.Ya, I've never really understood that......especially if you're going with a small diesel. My 7.3L Powerstroke takes 15qts of oil, and I still don't think it's that much different for costs. I use Mobil Delvac oil and pay around $3/qt, compared to the Mobil 1 I use in all our gassers at closer to $5/qt. So even with 15qts that's $45 versus $25 (or $35 in my Tundra). $10 for an oil filter (similar to gas), $26 for a fuel filter every 10-15k, and that's it as far as "diesel specific" maintenance. That would be less difference for a smaller engine, but with the new ones you do have the DEF costs.