Table 3 Bus service maintenance data from municipal transport company.

From: Degradation of anti-wear additives and tribological properties of engine oils at extended oil change intervals in city buses

  

Bus ID

2378

2384

2400

2414

2420

Bus mileage

Overall [km]

874,729

868,964

130,719 (766,480)

704,454

77,240 (750,328)

oil interval [km]

70,600

48,864

80,984

66,238

77,240

oil interval

start [date]

28.07.2022

07.05.2023

13.03.2023

02.08.2022

11.11.2023

end [date]

22.09.2023

19.06.2024

06.06.2024

02.08.2023

28.06.2024

Mean value of operational availability during 1 year (from 05.2023–05.2024) [%]

80.8

77.4

83.5

72.8

86.2

  1. Data from overall mileage showed in (..) presents mileage when entire engine or the engine head of the bus was replaced.