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How Much ZDP is Enough?
Technical Paper
2004-01-2986
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Zinc dithiophosphate, or ZDP, for over 60 years has been used as an additive in engine oils to provide wear protection and oxidation stability in an efficient and cost effective manner. Unfortunately, ZDP contains phosphorus, and phosphorus is a widely known and accepted poison of automotive catalysts and other emissions system components. Because of this, phosphorus (and ZDP) levels in automotive engine oils have been gradually reduced by about 35% over the last 10-15 years, and further reductions are likely in the future. This paper traces the history of ZDP use in automotive engine oils, and addresses the issue of how much (if any) ZDP is actually required to provide wear protection in today's, as well as yesterday's, engines. The focus in the paper is on wear (including scuffing) protection, and not on the other aspects of ZDP performance, such as providing oxidation stability of the oil. It is assumed that these other functions of ZDP can be provided by other ashless and phosphorus-free additives which do not negatively affect emissions system performance.
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Citation
Olree, R. and McMillan, M., "How Much ZDP is Enough?," SAE Technical Paper 2004-01-2986, 2004, https://doi.org/10.4271/2004-01-2986.Also In
References
- Gibson H.J. “Fuels and Lubricants for Internal Combustion Engines - An Historical Perspective,” SAE Paper 821570 March 1982
- Chamberlin W.B. Kelley J.C. Wilk M.A. “The Impact of Passenger Car Motor Oils on Emissions Performance,” JSAE paper 20030347
- SAE Information Report “Engine Tests for Evaluating Crankcase Oils,” 1942 May 1959
- Hall C.A. Martin E.A. “Single-Cylinder Test Techniques for Engine Oils - Part One: CRC L-38 Test Work,” Fourth Pacific Area National Meeting Los Angeles, CA Oct. 1-3 1962
- Etchells E.B. Thomson R.F. Robinson G.H. Malone G.K. “The Interrelationship, Design, Lubrication, and Metallurgy in Cam and Tappet Performance,” SAE # 472 (560017) SAE 50 th Anniversary Passenger car, Body and Materials Meeting March 1955 Detroit, MI
- Bennett P.A. Malone G.K. Murphy C. K. “An Engine Test for Predicting the Performance of Engine Lubricants in Most Severe Passenger Car Service,” SAE Transactions 69 1961
- Abell R.F. “I.C. Engine Cam and Tappet Wear Experience,” SAE 770019
- Kabel R.H. “Engine Sequence Tests for Determination of Lube Oil Quality,” NBS Workshop Gaithersberg, MD November 22 23 1976
- Gallopoulos N.E. “Engine Oil Thickening in High Speed Passeneger Car Service,” SAE 700506 , SAE Mid-Year Meeting May 18-22 1970
- Rodgers J.J Kabel R.H. “A Revised Sequence IIIC Engine Test,” SAE 780259
- Philo M. February 5 2001
- “ASTM REFERENCE OILS,” ASTM Test Monitoring Center
- Smolenski D.J. Bergin S.P. “Development of the ASTM Sequence IIIE Engine Oil Oxidation and Wear Test,” SAE 881576
- Clark S.L.
- Bergin S. Clark S.L. McMillan M.L. Domonkos D. Nahumck W.A. “Development of the Sequence IIIF Engine Oil Test,” ASTM Research Report D 2-1491 ASTM Test Monitoring Center
- Clark S.L. Lang P. McMillan M.L. Olree R.M. Shoffner B. Weber B. Yowell M. “Enhancement of the IIIF Engine Oil Test,” ASTM Research Report Annex D 2-1491 ASTM (Test Monitoring Center)
- Nahumck W.A. Hyndman C.W. Cryvoff S.A. Development of the PV-2 Engine Deposit and Wear Test - An ASTM Task Force Progress Report
- Clark S.L. Olree R.M. Lang P. Leverett C. Bowden D.H. “Development of the Sequence IIIG Engine Oil Certification Test,” SAE 2004-01-2987
- Bennett P. “A look at the Effects of Lubricant Additives on Surfaces,” SAE 107A (SAE 580111 )
- Kano M. Tanimoto I. “Wear Mechanism of high wear-resistant materials for automotive valve trains,” Wear 151 1991 229 243 International Conference on Wear of Materials Orlando FL April 7-11 1991
- McGeehan J.A. Yamaguchi E.S. Adams J.Q. “Some Effects of Zinc Dithiophosphates and Detergents on Controlling Engine Wear,” SAE 852133
- Roby S.H. Reba R.M. “Investigation of Sequence IIID Valve Train Wear Mechanisms. Part II. The Influence of Maganese Phosphating on Wear Performance,” STLE Lubrication Engineering 45 12 773 782
- Smolenski D.J. Kabel R.H. “Evaluation of Camshaft and Lifter wear, Deposits, and Oil Thickening with Low-Phosphorus Engine Oils in Taxicab Service,” SAE 861516
- Bell J.C. Colgan T.A. “Critical physical conditions in the lubrication of automotive valve train systems,” Tribology International 24 April 1991
- McGeehan J.A. Yamaguchi E.S. “Gasoline-Engine Camshaft Wear: The Culprit is Blow-By,” SAE 892112
- “Engine Oil Performance and Engine Service Classifications,” SAE J183
- Bardy D.C. Franklin T.M. Roberts C.E. “A 2.3L Engine Deposit and Wear Test - An ASTM Task Force Progress Report,” SAE 780260
- Roby S.H. Blalock K.D. “Dispersant, Detergent, and Oxidation Inhibitor Effects in Gasoline Engine Lubricant Testing,” Tribology-Solving Friction and Wear Problems 3 10 th International Colloquium
- Roby S.H. Abraham W.D. Blalock K.D. Cowling S.V. Dix R.W. Jones R.N. Kornbrekke R.E. Righi D.W. “The Effect of Zinc Dialkyldithiophosphate (ZDP) on Valve Train Wear Rates and Mechanisms in the ASTM Sequence VE Engine Dynamometer Test,” Tribology-Solving Friction and Wear Problems 3 10 th International Colloquium
- Roper G.W. Bell J.C. “Review and Evaluation of Lubricated Wear in Simulated Valve Train Contact Conditions,” SAE 952473 , SP 1116
- Hanada K. Murakami Y. Shoji Y. Aihara H. Hirose A. “Development of a Valve Train Wear Test Procedure for Gasoline Engine Oil,” SAE 940794
- Gao H. McQueen S. Black E.D. Bjornen K.K. Gangopadhyay A.K. Jensen R.K. Soltis E.A. “Antiwear Performance of Low Phosphorus Engine Oils on Tappet Inserts in Motored Sliding Valvetrain Test,” SAE 2003-01-3119
- Khorramin B. Kaleli. H. Perez J.M. “Oxidation Stability of Some Phosphorus-Free Fully Formulated Crankcase Oils,” SAE 982581 , SP-1389