For one, the additives that you add regularly would be something like Power Service. A whole bottle cost $3.47 at Walmart and is good for 100 gallons. Basicly the additives cost next to nothing, per gallon. Lubro Moly Diesel Purge should be done twice a year, costing a total of $20. Diesels have no sparkplugs, distributor caps, or rotors that require regular replacement. Using synthetic oil and the miles you drive, you would only do 2-3 oil changes a year, vs. 6. Just for basic math, look at the oil changes. A filter will cost $8 and 8 qts of oil, $32. So that is $40 per change and you do 2 changes a year, $80. Doing regular oil changes with dino oil, every 3K works out to $20 per change, times 7 works out to $140. So right there there is a savings. Actually that would apply to any Benz using synthetic.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member