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Actually, a lot of E39 8 cylinder owners were experiencing sludge on extended change intervals.
BMW doesn't spend millions on oil analysis, they design to particular viscosity and lubricity specs with desired additives. An oil company that wants the LL01 spec submits samples at their expense.
How many engines, BMW or otherwise, fail because of lubrication failure? Such failures are rare and usually due to operator error ... Think 3 quarts low and driving like you stole it.
That said, I'm not sure a diesel spec oil is ideal for gasoline powered cars, primarily because the additive package is likely quite different for the unique qualities of a Diesel engine.
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