400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-0790 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2006-01-3241 The Oxidative Stability of GM’s DEXRON®-VI Global Factory Fill ATF Brent Calcut and Roy Fewkes General Motors Corp. Powertrain & Fluid Systems Conference & Exhibition Toronto, Canada October 16-19, 2006Downloaded from SAE International by Univ of California Berkeley, Sunday, August 05, 2018The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE's peer review process under th e supervision of the session organi zer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth DriveWarrendale, PA 15096-0001-USAEmail: [email protected]: 724-772-4028 Fax: 724-776-3036 For multiple print copies contact: SAE Customer Service Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-0790Email: [email protected] ISSN 0148-7191 Copyright © 2006 SAE International Positions and opinions advanced in this paper are those of the author(s ) and not necessarily those of SAE. The author is solely responsible for the content of th e paper. A process is available by which discussions will be printed with the pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publicat ion by SAE should send the manuscript or a 300 word abstract to Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Univ of California Berkeley, Sunday, August 05, 2018ABSTRACT A detailed description of the oxidative stability of GM’s DEXRON®-VI Factory Fill Automatic Transmission Fluid (ATF) is provided, which can be integrated into a working algorithm to estimate the end of useful oxidative life of the fluid. As described previously, an algorithm to determine the end of useful life of an automatic transmission fluid exists and is composed of two simultaneous counters, one monitoring bulk oxidation and the other monitoring friction degradation [1]. When either the bulk oxidation model or the friction model reach the specified limit, a signal can be triggered to alert the driver that an ATF change is required. The data presented in this report can be used to develop the bulk oxidation model. The bulk oxidation model is built from a large series of bench oxidation tests. These data can also be used independent of a vehicle to show the relative oxidation resistance of this fluid, at various temperatures, compared to other common lubricants. INTRODUCTION GM’s DEXRON®-VI global factory-fill Automatic Transmission Fluid (ATF) is a very robust fluid in all aspects of transmission lubricant durability, when compared to the previous factory-fill ATF formulations used by GM. A degradation model had been developed and is in use with the previous DEXRON ®-III factory-fill ATF that predicts the useful life of the lubricant based on bulk oxidation resistance and friction durability [1]. However, because the new global factory-fill ATF is significantly more durable than DEXRON ®-III, the algorithms need to be updated to take advantage of the superior performance. In order to do this, both the bulk oxidation resistance and friction durability of the lubricant need to be fully characterized. This report presents the data necessary to generate the bulk oxidation portion of that degradation model. To fully characterize the oxidation stability of the fluid a series of bench oxidation tests were completed at various temperatures. The fluid’s oxidative stability can be described either by the leng