Technical Paper
A Cold Start and Pumpability Study of Fresh and Highly Sooted Engine Oils in 1999 Heavy Duty Diesel Emission Engines
2003-10-27
2003-01-3224
The new API CI-4 category defines oil quality suitable for 2002 EGR-equipped heavy duty diesel engines. Included in the category is the first used oil low temperature MRV (Mini-Rotary Viscosity) limit. Over the past 15 years heavy duty pumpability studies have been the focus of a number of studies but few have evaluated used engine oils, particularly at the high soot loadings expected in EGR-equipped engines. To gain a better understanding of rheological effect, Imperial Oil initiated fired pumpability tests of sooted and fresh oils. Three 1999 model year Class 8 heavy duty diesel trucks equipped with engines from three popular manufacturers were chosen for the study conducted in Imperial Oil's All-Weather Chassis Dynamometer. Fresh 15W-40's were compared to used 15W-40 oils taken from severe line-haul service where soot loadings were in the 6-7% range; limited testing was also conducted on a fresh 0W-40 formulation.