High Quality Content by WIKIPEDIA articles! The BMW N53 is BMW's latest and most modern straight 6 engine, released in 2007 in the facelifted BMW 5 Series (E60/E61) and the BMW 3 Series (E90/E91/E92/E93). It is an improvement on the N52 Naturally Aspirated (NA) engine mainly since it has gasoline direct injection technology and can burn stratified. However, unlike its predecessor, it does not contain BMW's Valvetronic technology due to space limitations in the cylinder head.BMW does not plan to put the N53 engine for sale in Australian and North American models due to the high sulphur content of the fuel available in these markets. The N53 is BMW's 14th generation production straight six engine. It makes use of HPI: High Precision Injection or Direct Injection, which consists of Piezo-electric injectors directly in the cylinder.

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