A lot of information about oil is taken from unknown circumstances. Lots of factors are just plain unknown when a uoa is posted or someone praises or trashes a certain oil and a snap-shot makes it even worse. Example, one of our customers has a deliver truck running Delo 400 15w-40 oil. Great uoa's and a lot of miles. Last year I found out that he buys the oil in bulk and changes it every 1 to 1.5k miles. The truck gets driven only by him and about 100 to 200 miles a day, 5 days a week, 40 to 50 weeks a year, no rush-hour or stop and go driving. Delo looks real good, here in Southern California in this truck, maybe better than in a truck that has weather, stop and go driving with short trips, driven by someone with a heavy foot, with the most expensive synthetic oil. Given half a chance this oil we are discussing should do a good job. What we are missing, is a method of direct comparison at a reasonable price. Testimonals are hard to figure out.