One of the most important characteristic of a car lubricant is the acidity. A high acidity value negatively affects the oil pump and the entire car engine.
A quality oil has low acidity value and reduce the increase in acidity due to the chemical reactions that occur during its use.
The figure in the table show the acidity values of the oil samples with and without #GXTLUBE. The base oil is a generic 5W-40, while the acidity values are expressed as TAN1 (Total acid number).
| LUBRICANT | DESCRIPTION | TAN |
| 5W-40 | BASE OIL | 1,9 |
| 5W-40 + GXTLUBE | BASE OIL | 1,6 |
| 5W-40 | USED FOR 7600 km | 3,6 |
| 5W-40 | USED FOR 7700 km | 2,1 |
Several road tests are ongoing, both with cars and motorcycles, to evaluate the real advantage for the end user in various operating conditions.
[1]The test were performed according to the standard (ASTM D974-21), which allows to measure the acidity or basicity of synthetic and mineral oils through a colorimetric titration.