How oil burning can cause oil volatility. Oil volatility depends on its fractional composition. The higher content of light fractions in the engine oil, the higher is the oil burning. All-seasons engine oils have a hard constraint of volatility-no more than 15%, according to technical requirements.
Our method does not fully comply by its time-consuming with standards, so it’s not necessary to consider the absolute values. We are interested in the comparative values. In our case, 6 samples were taken from each of 10 oils (see. prev. post). Thus we noted oil weight loss after 15, 30 minutes, 2 hour, 4 hour, 6 hours and 8 hours in the oven.
Test results of oil volatility (after 8 hours in a oven):
Lukoil Genesis Claritech — 2,9%
Shell Helix Ultra — 3,2%
Castrol Edge Titanium — 3,3%
Motul Ecolite — 3,7%
Mobil 1 — 3.8%
Lukoil Genesis Armortech— 4,3%
Castrol Magnatec - — 4,4%
Total Quarts — 4,6%
Gazpromneft G-Energy — 5,0%
+ Out of the contest — Idemitsu Zepro oil 0w-20 – 5.8% - the only low-viscosity oil in our test. That means that Zepro has a different composition, different purpose, and different properties. It cannot be compared with w-30 oils by volatility.
In our test, we have the full-SAPS and low-SAPS oils. However, this does not affect the volatility. But there is a dependence between oil volatility and viscosity — the lower the viscosity of the oil, the higher its volatility. But later we will test this separately with a few other oils.
Lukoil Genesis Claritech in this test showed the best result. However, this was only one of the oil evaluation test methods, which only shows the quality of the base oil. Next time we will tell about other methods of choosing and testing of engine oils and summarize the research results.