BMW N53

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The BMW N53 is a naturally aspirated straight-6 petrol engine which was produced from 2006 to 2013. The N53 replaced the BMW N52 in certain markets and debuted on the post-facelift E60 5 Series. In European markets, the N53 began replacing its port-injected parent, the BMW N52, in 2007. Markets such as the United States, Canada, Australia, and Malaysia retained the N52, as the N53 was deemed unsuitable due to the high sulfur content of local fuel. The N52 and N53 are the last naturally aspirated straight-six engines produced by BMW, ending a history of continuous production of this engine configuration since the BMW M30 in 1968. In 2011, the N52 began to be replaced by the BMW N20 turbocharged four-cylinder engine. N53 production ceased in 2013. There is no BMW M version of the N53. The BMW N54 turbocharged straight-6 engine was produced alongside the N53.