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I went ahead and used the Castrol.
These diesel oils offer the benefits of synthetics without the cost. I suspect the "longer oil change interval" benefit of synthetics is largely marketing hype, designed to justify their higher cost. While synthetics may hold their viscosity longer, thay cannot neutralize engine pollutants, which means your engine bathes in its own filth for 10,000 miles instead of just 3,000.
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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