The growing interest and concern over the problem of the high temperature viscosity of engine oils and its effect on the engine performance, following the proposal for revision of the SAE J 300, pushed the CEC Engine Lubricant Technical Committee to establish an Investigation Group (IGL 9) to investigate the subject of Viscosity Measurements at High Temp
The Low Temperature aspects are mainly covered by the CEC Investigation Group IGL 8 and the German National Organization DKA Study Group.
The IGL 9 Group agreed to circulate a questionnaire which was gratified with high degree of attention; 31 companies answered confirming the importance of the investigation and the requirement of viscosity measurements more realistic and in line with to day's engine operating conditions.
A first screening work carried out on some reference oils has demonstrated the possibility of correlation among different bench measuring techniques and an engine. The second stage now underway sees a new set of 9 test oils formulated using different polymer species commercially available, to be submitted to 22 “engine viscosity” and “viscosity rig” tests to define correlations where possible.