
84 LIGHT AND HEAVY VEHICLE TECHNOLOGY
6000 miles (10000 km) or six months, whichever comes
first. More frequent oil changes may sometimes be
specified when the car is subjected, for example, to a
fair amount of stop-start driving.
4.4 ENGINE LUBRICATION SYSTEMS
Wet sump system
A splash type of lubrication system was used for the
engines of early motor vehicles. Lubrication of the
working parts was initiated simply by allowing the
connecting rod big ends to dip into a trough of oil in the
crankcase each time they passed through their BDC
positions. To improve the lubrication of their bearings,
the big ends were often provided with oil scoop