The experimental study on the physical chemical index

tribological property and engine friction work was carried out to verify the feasibility of using the regenerative lubricating oil for bus diesel engines. Results show that the physical and chemical characteristics of the regenerative lubricating oil are at the same level with the 15W 40 lubricating oil used by the original engines

which can meet the requirements of viscosity temperature and anti oxidation properties

etc. of 15W-40 lubricating oil specified in GB 1122—2006.Compared with the original lubricating oil

use of regenerative lubricating oil will not only produce larger wear scars

longer and deeper furrows

and wider scratches

but also make the extreme pressure lubrication performance worse. In hot motoring test

the engine using the two kinds of lubricating oil has basically the same friction work

while in cold motoring test

the use of regenerative lubricating oil will cause a slight reduction in friction work.