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Difference between B46 and B48?
What are the differences between the B46 in the 2 series and the B48 in the 3 series? I read that the B48 put a couple of critical components like the VANOS and timing chain at the back of the engine. And if either ever needed work it would require an engine out service ($$$). I'm assuming the B46 is just a variant of the B48, but does anyone know if it also has that critical Achilles heel?
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