I have always gone thru the wheel well on my 2012 6.7C...never really liked the approach but better than going thru the top...today, I dropped my light, rolled under the chassis, went to retrieve it and DUH...I can reach the filter from underneath with a standard 3/8 inch cap wrench...and a 3/8 12 inch extension... holy cow, so easy...and so much faster...didn't even need the filter plug, she fell right out...