This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development and Use of the PSU Microoxidation Test for Diesel Engine Oils
Annotation ability available
Sector:
Language:
English
Abstract
The Perm State Microoxidation Test has been used previously to rate the thermal and oxidative stabilities of III C and III D automotive engine sequence reference oils. These ratings show good correlation with the results in the actual engine tests. In this paper, the oxidative and thermal stabilities of a series of heavy duty diesel engine oils are compared with III C and III D reference oils in the PSU microoxidation test using deposit level and overall production of high molecular weight condensation polymers (sludge precursors). These data show the heavy duty diesel engine oils to be more stable than typical III C and III D reference oils. The ratings of the heavy duty diesel engine oils in the PSU microoxidation test based on high molecular weight condensation polymer (sludge precursor) or deposit show excellent correlation with the ratings of the same oils in a 250 hour test in a heavy duty diesel engine.
Test severities of the microoxidation testa run at Penn State and Caterpillar have been compared. The consistently more severe test results obtained at Penn State are within typical interlaboratory repeatability, and are probably due to a difference in fluid temperature during the test of 2° to 4°C.
A comparison of diesel oil formulations at several temperatures show that the relative ranking of the stability of such oils will change with increasing temperatures. A comparison of mineral oil versus synthetic base lubricants shows that for the same relative behavior in the microoxidation test at 225°C, the rating of the synthetics improve relative to the mineral oils as the temperature is raised to 245°and 270°C.
Recommended Content
Citation
Perez, J., Kelley, F., Klaus, E., and Bagrodia, V., "Development and Use of the PSU Microoxidation Test for Diesel Engine Oils," SAE Technical Paper 872028, 1987, https://doi.org/10.4271/872028.Also In
References
- Klaus, E. Krishnamachar V. Dang H. “Evaluation of Base Stock and Formulated Lubes Using the Penn State Microoxidatlon Test” 285 94 1980
- Cho, L. F. Klaus E. E. “Microoxidatlon Evaluation of Automotive Crankcase Oils” SAE Sp. Pub. 558 1 23 1983
- Klaus, E. E. Cho L. Dang H. “Adaptation of the Penn State Microoxidatlon Test for the Evaluation of Automotive Lubricants” SAE Paper No. 801362 SAE Sp. Pub. 80-473 83 92 1980
- Lahijani, J. Lockwood F. E. Klaus E. E. “The Influence of Metals on Sludge Foraation” ASLE Trans. 25 1 25 32 1982
- Klaus, E. E. Shah P. Krishnamachar V. “Development and Use of the Microoxidation Test with Crankcase Oils” Proceedings of the Conference on Measurements and Standards for Recycled Oil The National Bureau of Standards September 1982
- Cvitovic, E. Klaus E. E. Lockwood F. “A Thin-Film Test for Measurement of the Oxidation and Evaporation of Ester-Type Lubricants” ASLE Trans. 22 395 1979
- Lockwood, F. Klaus E. E. “Ester Oxidation - The Effect of an Iron Surface” ASLE Trans. 25 2 236 44 1982
- Klaus, E. E. Ugwuzor D. I. Naidu S. K. Duda J. L. “Lubricant Metal Interaction Under Conditions Simulating Automotive Bearing Lubrication” Proceedings of the JSLE International Tribology Conference 859 64 Tokyo, Japan July 1985
- Cho, L. Klaus E. E. “Oxidative Degradation of Phosphate Esters” ASLE Trans. 24 1 119 24 1981
- Gunsel, S. Klaus E. E. Bailey J. L. “Evaluation of Some Poly-Alpha Olefins in a Pressurized Penn State Microoxidatlon Test” ASLE Preprint No. 86-AM-2C-1 May 1986