Browse Publications Technical Papers 2007-01-0003
2007-01-23

Influence of Fuel Properties on Lubricant Oxidative Stability: Part 2 - Chemical Kinetics Modelling 2007-01-0003

Previously reported tests (SAE 2005-01-3839) suggest that lubricant oxidative stability can be improved by running a spark ignition engine with fuels rich in light olefins (e.g. from a catalytically cracked refinery stream).
To further our understanding, we have modelled the influence of fuel chemistry on the kinetics of lubricant oxidation. In the hypothesis presented here, the olefins interfere with key chain branching reactions in the lubricant oxidation process and react to form epoxides, which are sufficiently volatile to leave the lubricant.
The modelling also predicts that ethanol has a directionally beneficial effect on lubricant oxidative stability. The effect of this will be limited because ethanol is much less soluble in lube-oil under prevailing engine conditions than heavier hydrocarbon components.

SAE MOBILUS

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

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% 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

Influence of Fuel Properties on Lubricant Oxidative Stability:Part 1 - Engine Tests

2005-01-3839

View Details

TECHNICAL PAPER

The Analysis of Observed Burn Rates in a Spark-Ignition Engine and the Relation to Fuel Properties

2003-01-3125

View Details

TECHNICAL PAPER

Investigations of Lubricant Sludge Formation in the Field: Development of an Effective New Fleet Test Technique

910748

View Details

X