What Are Common BMW B57 Engine Problems?
Image: BMW B57D30A complete engine with just 40K miles for sale at MT Auto Parts for £4,489.99 The BMW B57 is a 3.0-litre straight-six turbo-diesel that has been in production since 2015, replacing the older N57. You will find it across a wide range of BMWs, the 5 Series (G30/G31), 7 Series (G11/G12), X5 (G05), and the newer X6 (G06) and X7 (G07). The most common variant, the B57D30A, is popular for good reason: strong performance, a genuinely smooth driving character, and solid real-world fuel efficiency for a six-cylinder diesel. It is also a meaningfully more dependable engine than the N57 it replaced, with a front-mounted timing chain rather than the N57's troublesome rear-mounted design. That said, no engine is entirely without weak points, and knowing what to watch for on a B57 helps you catch problems early rather than after they have become expensive. Common Issues with the BMW B57 Engine 1. EGR Cooler Leaks (Exhaust Gas Recirculation) This is the most widely reported faul...