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Having a 535d as well, I've looked into the oil thing too. As far as I know, LL04 is required as it's a low ash content is necessary with the diesel's pollution controls. While a BMW sticker under the hood recommends the use of 0W-30 oil, I not found one with the LL04 rating. The good news, however, is that Walmart sells a Pennzoil synthetic (made from natural gas) with a LL04 rating and the label specifically mentions BMW and diesels. It is a 5W-30 and sell for less than $30 for a 5 quart bottle.
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