Neither my IDI vw or IDI Mahindra turn the oil black like the Mercedes does. I blame the amount of oil still in the system when I change it. I would figure that the design would allow for changing it but I guess it doesn't.

AS far as changing the oil every 1000 miles. 2 gallons every 1000 would pay for a rebuild at some point wouldn't it. I change my oil about 3-5000 miles. Like others I scored M1 5w40 truck oil in January.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.