Piston detergency and anti-wear performance of non-phosphorus and non-ash engine oil 2019-01-0021
It has been recently reported that sulfated ash derived from engine oil deteriorates DPF performance due to accumulation on the filter surface. In addition, it has been commonly understood that phosphorus from engine oil adsorbs onto catalytic metal surface and degrades the performance. From this background, sulfated ash and phosphorus in engine oil have been reduced. From this point of view, the authors have developed the novel engine oil (NPNA) which includes no phosphorus and no sulfated ash from metal detergent and ZnDTP and also introduced its competent performance by several engine tests for piston detergency and anti-wear performance.
However, piston detergency performance of NPNA needs to be enhanced for engines which are operated under more severe conditions. Therefore, we have examined several additives which do not contain any metal elements and evaluated the performance of piston detergency using some laboratory test methods such as a hot tube tester. An actual engine test was then carried out with some candidates of NPNA.
We used a Caterpillar engine test which is standardized in ASTM D6750 and evaluated WDN (Weighted total demerits for 1N) for the piston. Also, anti-wear performance of NPNA was evaluated with a Hino N04C-VH engine test which is standardized in JASO M354:2016. It was found that one of NPNA candidates showed an excellent piston detergency and anti-wear performance.