POUR POINT DEPRESSANT SELECTION FOR TODAY'S ENGINE OILS AGED IN THE PRESENCE OF BIODIESEL BY CEC L-105
The ability to control oil low temperature viscosity is a crucial
performance criterion in lubricants. Proper management of cold
temperature viscosity can extend operating temperature ranges,
enable good oil pumpability and enhance hardware protection. Low
temperature viscosity standards have evolved over the years. The latest
trends focus on aged oil viscosity to guarantee performance retention
during operation. In Europe, diesel engine oil low temperature
viscometric performance was recently updated in the ACEA 2012
specification, emphasizing the effect of oil oxidation in the presence of
biodiesel by CEC-L-105-12. In this paper, we will show that a well
selected PPD can meet the latest ACEA requirement for low
temperature performance. We will examine how the multiple low
temperature requirements and the influence of the other additives
tend to narrow the choice of acceptable PPDs. The requirement for CEC
L-105 has made PPD selection more challenging but certainly
achievable.