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Expensive cosmetics can lead you to petroleum-based ingredients and also other synthetic materials who have questionable safety testing records. Why not use safe, skin oils in your beauty routine instead? When you know an ingredient is healthy to consume, it is certain it really is safe to use on the skin, your own body's largest organ. The EGR system routes a number of the exhaust gases (6 ? 10%) from the EGR valve, last on the Intake System, and ultimately within the combustion chamber. The exhaust gases are inert i.e. they cannot burn in the combustion chamber; also, the exhaust gases take up a number of the space which would preferably be taken with the intake air. This reduces the volume of intake air readily available for the combustion process during each Power Stroke; which in turn decreases the peak combustion temperatures. This brings about lower NOx emissions.