regular motor oil

regular motor oil

[′reg·yə·lər ′mōd·ər ‚ȯil]
(materials)
A petroleum lubricating oil suitable for use in internal combustion engines under normal operating conditions.
References in periodicals archive ?
The synthetic oils are better oils because they cause less wear on the engine, but they're twice as expensive as regular motor oil.
The re-refined motor oil, which meets or exceeds the highest North American standards for motor oil performance in gasoline engines, requires up to 85% less energy to produce than regular motor oil.
Additionally, products like Valvoline's MaxLife Motor Oil do more than regular motor oils by helping to fight aging so you can hold on to your vehicle even longer.