2.00 grams of each oil below were put in separate anodized aluminum cups on a "hot plate" with oil temps at ~340F degrees. Values below are the measured weight loss as a percentage of initial oil weight at 4 and 8 hours. Weights were measured with an Ohaus digital balance (Adventurer Pro AV412) that reads to 0.01 grams; accuracy of measurements below are +-0.5%. 1. Lubromoly 5W-40: At 4 & 8 hours: 7.0% & 12.0% 2. Lubromoly 0W-40: At 4 & 8 hours: 8.0% & 14.5% 3. Castrol Syntec 0W-30 ("Gold GC"): At 4 & 8 hours: 9.0% & 17.5% 4. Mobil 1 5W-30 (API SM version): At 4 & 8 hours: 14.0% & 25.5% The test procedure does not follow any standardized volatility test procedures of the oil industry because I don't have that capability. So don't compare these values to directly to any published NOACK volatility values; the values measured above should be compared relative to each other. But the trends between different oils done by the above test procedure should in most cases be similar to the trends of oils tested by the NOACK test procedure, although the numerical values themselves will certainly be different.