Join Now

DGMK-Project Automotive Fuels

Development of a No-Harm application test as a replacement for the XUD-9 engine test - investigations with the Diesel Deposit Formation Test as well as the ENIAK test bench test

2022 - 2024 (planned, 30 months)
Research Center
University of Rostock
Chair for Piston Machines and Internal Combustion Engines
Prof. Dr.-Ing. Bert Buchholz, Dr. Ulrike Schümann, Dr. Fanny Langschwager

OWI Science for Fuels gGmbH
An-Institut der RWTH Aachen
Dr. Wilfried Plum, Dr.-Ing. Elmar Pohl
Sebastian Feldhoff, Oliver Zöllner, Karin Brendel
Reason and Goal

For the testing of additives and the avoidance of undesirable side effects in diesel fuels, there is a catalogue of criteria agreed by the mineral oil and additives industry. Among other things, this catalogue contains an engine application test for injector coking (XUD-9 CECF-23-01). This CEC-certified XUD9 test is based on outdated technology and, in particular, the increasingly difficult spare parts situation requires a suitable alternative in the near future. The CEC replacement test (DW10b) intended for this purpose is generally considered by industry to be too expensive and often unsatisfactory in terms of technical/scientific significance. The aim of the joint project is therefore to develop a suitable and cost-effective no-harm application test for additives to replace the obsolete XUD-9 engine test (CECF-23-01). The new test method should cover both current and future fuel and additive technologies as well as injection concepts. In addition, it is intended to be meaningful not only for external (EDID) but also for internal injector deposits (IDID), which are becoming increasingly relevant.


The subject of the method development is a combination of two complementary concepts, the "Diesel Deposit Formation Test" (DDFT, LKV) as a laboratory test and an application-oriented injector coking test ("ENIAK", OWI). Within the scope of the project, suitable boundary conditions, fuel references and evaluation criteria for the additive tests are to be developed first (setting of a basic performance). Subsequently, numerous fuel-additive combinations of antioxidants, cold flow improvers and lubricity improvers will be comparatively investigated and evaluated. The results of the method development will be documented in detail and made available to interested companies in a timely manner.

Currently, no-harm testing of additives is very complex and expensive. Therefore, there is innovation potential here for SMEs, e.g. additive formulators, analysis service providers, equipment manufacturers, to bring new products to market faster and more cost-effectively or to open up new business areas. Cost-effective screening by means of laboratory tests will make it possible to avoid expensive test bench tests in the future. At the same time, self-directed tests will be possible. IDIDs that occur can be detected sooner thanks to modern analysis technology, thus reducing or avoiding warranty cases in the field and recourse claims by customers.


IGF application in preparation