Browse Publications Technical Papers 2005-01-2174
2005-05-11

Pour Point Depressant Robustness after Severe Use in Passenger Car Engines in the Field and in the Sequence IIIGA Engine 2005-01-2174

The new ILSAC GF-4 specification for Passenger Car Motor Oils includes a measurement of low-temperature viscosity after the Sequence IIIGA engine test.
The measurement is conducted according to ASTM D 4684, the well known TP-1 MRV (Mini Rotary Viscometer) procedure. While the limits are the usual values found in SAE J300 which are no measurable yield stress and 60,000 mPa.s maximum, it is tested five degrees Centigrade warmer than called for by the fresh oils' SAE W grade. The need for this new measurement and specification is based on the finding that some PCMO lubricants' low-temperature/low-shear rate viscosities, but not necessarily their higher temperature rheological properties, were seriously degraded in severe oxidative environments.
Because of this new focus on low-temperature rheology after facing a severe oxidative engine test, it became of interest to understand the robustness of the Pour Point Depressant which is the additive usually responsible for controlling wax related cold temperature rheology properties.
SAE 5W-30 oils, otherwise fully additized, were formulated with and without Pour Point Depressant (PPD) so that fresh oil, used oil, and used oil with PPD added after use could be compared relative to cold temperature TP-1 MRV behavior. These oils were degraded by 1) laboratory mechanical shearing, 2) field service in extended drain taxi tests, and 3) Sequence IIIGA engine tests.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Next Generation Mineral Axle Oils for Long Drain Applications

2004-28-0094

View Details

TECHNICAL PAPER

Wear of Valve Train Components Due to Soot Contaminated Lubricant

2006-01-1098

View Details

TECHNICAL PAPER

Low Temperature Rheology of Engine Lubricants: Investigation of High Used Oil Pumping Viscosity

2000-01-2944

View Details

X