Transmission Oil Aging – Passenger Car Manual Gearbox Applications (Part Two – Accelerated Testing and Field Performance)

2009-01-2633

11/02/2009

Event
SAE 2009 Powertrains Fuels and Lubricants Meeting
Authors Abstract
Content
An accelerated test methodology has been developed to reproduce long-term aging of Automotive Gearbox Lubricants. This test is essentially an anaerobic thermal stress test adapted from standard oxidation tests, except that nitrogen is bubbled through the oil instead of air or oxygen.
This test produces significant viscosity increase and heavy deposit formation with lubricants known to create similar problems in the field. However oils that remain stable in the field, that is do not increase in viscosity and do not lead to deposit formation also show no viscosity increase in this test. These fluids do show an increase in acid number and additive reactions/transformations that can be observed by 31P NMR.
Comparison with oxidation test results show that the nitrogen aging test gives closer results to known field performance.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-2633
Pages
9
Citation
Bouffet, A., and Abellaneda, G., "Transmission Oil Aging – Passenger Car Manual Gearbox Applications (Part Two – Accelerated Testing and Field Performance)," SAE Technical Paper 2009-01-2633, 2009, https://doi.org/10.4271/2009-01-2633.
Additional Details
Publisher
Published
Nov 2, 2009
Product Code
2009-01-2633
Content Type
Technical Paper
Language
English