Motor oils are exposed to high shear forces and temperatures while the motor is running.
Mechanical abrasions set iron and copper free, which acts as catalysts for oxidation. All this decrease the durability of motor oils. The oxidation stability with iron and copper catalysts can give an approximately indication for the shelf life.
A reproducible and accurate determination of the oxidation stability using the 892 Professional Rancimat can be realized.
For the analysis described in the downloadable application note, the following types of oils were used:
- Motor oil, SAE 5W/40, full-synthetic
- Motor oil, SAE 15W/40, semi-synthetic
- Motor oil, SAE 30, mineral oil, non-synthetic