Like most diesel engines, this BMW N57 uses an EGR - exhaust gas recirculation. What that means its some of the hot exhaust gases that still have some unburned fuel and oxygen are siphoned off, cooled and sent back into the intake. The problem though, is along with the cooled gas you also get sooty carbon that makes a huge mess of the intake and piping. Here's a look at how we went about cleaning the carbon buildup!
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We Tried To Clean This Dirty Intake… BMW N57 EGR Cleaning - At The Wheel
• We Tried To Clean This...
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