Here are my Blackstone results on my '82 300SD, 3200 miles. Looks like I'm pretty safe to run more miles on the oil.

I thought ya'll might be interested in seeing their report...

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EQUIPMENT MAKE: Mercedes Benz
EQUIPMENT MODEL: OM 617
FUEL TYPE: Diesel
OIL USE INTERVAL: 3,200 Miles
OIL TYPE & GRADE: Mobil Delvac 1300 15W/40
MAKE-UP OIL ADDED: 0 qts
ADDITIONAL INFO:

ADAM: The oil's viscosity was normal, but the low flash point shows about 2.5% of this sample was diesel fuel. You can get this much fuel from normal city driving or idling, so we are not worried about it at this point. If the fuel shows up again next sample, we'll let you know. We found no moisture or signs or anti-freeze in the oil. Wear metals were quite low and were in the correct balance, suggesting no mechanical problems inside the engine. Average oil use for this egine is about 5600 miles. You could probably extend your oil use if you wanted.

Sample Date: 01/22/05
MI/HR ON OIL 3,200
MI/HR ON UNIT 150,622

Value/Universal Avg
ALUMINUM 4/6
CHROMIUM 1/3
IRON 30/56
COPPER 2/3
LEAD 4/3
TIN 0/1
MOLYBDENUM 38/20
NICKEL 2/2
MANGANESE 0/1
SILVER 0/0
TITANIUM 0/0
POTASSIUM 4/144
BORON 35/144
SILICON 4/6
SODIUM 3/11
CALCIUM 248/2404
MAGNESIUM 347/312
PHOSPHORUS 1114/1107
ZINC 1345/1317
BARIUM 1/1

TEST Should Be: / Were:
SUS VISCOSITY @210F 68-78/ 78.5
Flashpoint >415 / 390
Fuel% <2.0 / 2.5
Antifreeze% 0 / 0
Water 0 / 0
Insolubles <0.7 / 0.6