Haven't posted before, but trying to learn some more about oil, additives, and such in general. I did a search and can't find any VOA on any Schaeffer's products. Has anyone done one before? I am particularly interested in a VOA of their 5w40 full synthetic as I run it in my diesel truck. Also does everyone send their stuff to get analyzed by Blackstone? I have a local shop that will do oil analysis for like $20 a sample. I didn't know if this was reasonable or not. Sorry for a long scatter-brained post but I'll appreciate any feedback.