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0W40 was the only recommended weight until 2007, when a special 5W40 low-ash oil became mandatory for the Bluetec diesels with urea injection. In order to simplify stocking, MB updated the sheet to allow the 5W40 low-ash for gasoline engines as well. For a short while, dealers were using this in all engines. But some problems arose, and almost all dealers now stock both oils, using the 0W40 in gasoline engines and 5W40 low-ash in diesels.
I would stick with the 0W40 for all gasoline engines.
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