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Message: <blockquote data-quote="DrGoh" data-source="post: 127658" data-attributes="member: 220">Actually, I think there are two versions of 2.5L E39.The M52B25, with 2.5 L (2494cc) version, was introduced in 1995. It produces 170 hp. Bore is 84 mm and stroke is 75 mm. (The M52B25 won the 2-2.5 L category of the International Engine of the Year awards for 2003 and 2004.)This is in 1995-2001 E39 5-Series.Whereas, the M54B25, is a 2.5 L (2494 cc) engine with an 84 mm bore and 75 mm stroke, introduced in 2001. It is all-aluminum with cast iron cylinder liners, fracture-split forged steel connecting rods, a one-piece cast camshaft, and a reinforced plastic intake manifold. Output is 184 hp.This is in 2001-2003 E39 525i.</blockquote>