Verification of deterioration properties of engine oil under water-rich condition Lubricants Research Laboratory, Idemitsu Kosan Co, Limited

Format:

Book

Conference/Event

Author/Creator:

Ōki, Hiroshi, author.

Contributor:

Takakura, Shiro

Conference Name:

2019 JSAE/SAE Powertrains, Fuels and Lubricants (2019-08-26 : Kyoto, Japan)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2019

Summary:

1. ABSTRACTIn general, metal-based detergents are used in engine oil to prevent the adhesion and accumulation of deposits and sludge. Because metal-based detergents are additives composed of fatty acid metal salts and carbonates, such as calcium, they are known to be easily affected by water. In particular, over-based metal-based detergents containing a large number of carbonates, which are excellent in terms of detergency, have been used often in recent years. Following the increasing use of biofuels and the diffusion of hybrid vehicles, the risk of water being mixed into engine oil has increased. For example, in hybrid vehicles, it is assumed that the engine oil temperature decreases and it becomes difficult for water to volatilize. Also, the E100 fuel contains several percent of water. Therefore, it has become important to understand the degradation characteristics of engine oil when water is immixed, which is the aim of this study.1) In this study, we operated an engine while intentionally introducing water into its combustion chamber. Based on the evaluated degradation characteristics, we examined a laboratory test method and established the test conditions. Using the examined laboratory test method, we evaluated the degradation characteristics of engine oil when water is immixed. Consequently, we found that the principal factor that decreased the total base number when water was immixed was the presence of carbonates in metal-based detergents. We also revealed that the type of soap base also affects the amount of decrease in the total base number. In the future, engine oils containing detergents that have excellent water resistance are expected to be developed using the laboratory test method established in this study

Notes:

Vendor supplied data

Publisher Number:

2019-01-2298

Access Restriction:

Restricted for use by site license