I have never lost an engine to wear. I lost one to sludge. Many of your comments focus on wear metals and staying in grade etc. I think there may be a whole other story that is not apparent to everyone. I've not done a uoa to try and compare motor oils because I don't feel a need to do that. I will do a uoa to check engine health. I know that no one is going to reveal any trade secrets, but I think being able to interpret the engine cleanliness factor is paramount. I like low wear, but I also want clean innards. I think there is a balance between wear and cleanliness. Much of the discussion here neglects that factor. Comments???? You all jump on an oil as being great because of low wear numbers, but we don't know what else is happening inside. It no fun to have your cake or to eat it too.