I have been using Mobil 1 0w40 Euro blend in my cars. First car is a 2007 AudiA6 3.2 which I change oil every 5k miles. Second car is a 2008 BMW X3 which I change every 7.5k miles. I was getting oil from walmart but it seems walmart is not selling it anymore. I was thinking of using Rotella T6. Can anyone think of a reason why this may cause me an issue??