Making it short. 2012 Impala started using oil at a qt per 3k ,not bad with no leaks. Yesterday she informed me that it was smoking while in school line so I need to go over and check out. This is the 4th vehicle that hits 150k then engine gets thirsty for oil which first 3 were Pennzoil conventional 3k oil changes and this one is Pennzoil Platinum 5k oil changes. This is looking more and more like a pattern. Engines are always clean.