Lubricant Additive Effects on Engine Oil Pumpability at Low Temperatures-Detergents and High Ethylene Olefin Copolymer Viscosity Modifiers

Passenger car and heavy-duty diesel engine manufacturers recognize the need to ensure that engine oils maintain adequate low-temperature pumpability performance throughout their working life. For over two decades, the Mini Rotary Viscometer (MRV TP-1) bench test has been used to develop oils that ha...

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Bibliographic Details
Published in:Tribology transactions 2007-04, Vol.50 (1), p.68-73
Main Author: Covitch, Michael J.
Format: Article
Language:English
Subjects:
Additives
Applied sciences
Cold
Cross-disciplinary physics: materials science
rheology
Degradation
Detergent
Detergents
Diesel engines
Dispersant
Energy efficiency
Engines and turbines
Exact sciences and technology
Friction, wear, lubrication
Interaction
Internal Combustion Engine Oils
Internal combustion engines: gazoline engine, diesel engines, etc
Low Temperatures
Lubricants & lubrication
Machine components
Mechanical engineering. Machine design
Mineral Basestocks
Physics
Pour Point
Pour Point Depressant
Rheological measurements
Rheology
Techniques and apparatus
Temperature effects
Tribology
Viscosity
Viscosity Index Improver
Viscosity-Temperature Behavior
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Summary:Passenger car and heavy-duty diesel engine manufacturers recognize the need to ensure that engine oils maintain adequate low-temperature pumpability performance throughout their working life. For over two decades, the Mini Rotary Viscometer (MRV TP-1) bench test has been used to develop oils that have protected engines from oil starvation failure during cold weather startup. The test was created to measure the low temperature flow properties of fresh oils. During engine operation, a number of changes take place in the lubricant-both chemical and physical-that can influence oil pumpability. This paper presents a systematic evaluation of the role that various common lubricant additives play in affecting MRV viscosity and pour point and reinforces the notion that new oil MRV is not necessarily a good predictor of used oil pumpability. Presented at the STLE Annual Meeting in Calgary, Alberta, Canada May 7-11, 2006 Review led by Lois Gschwender
ISSN:1040-2004
1547-397X
DOI:10.1080/10402000601105540