“…In that case, the lubricant oil experiences a higher shear rate, and the oil viscosity improver additive breaks down more quickly. More information on the effect of lubricant oil on diesel emissions can be found in Manni et al (1997), Stunnenberg et al (2001), Barr et al (2003), and McGeehan et al (2006). The effect of EGR on diesel engine oil is discussed by Sasaki et al (1997).…”