Hey everyone new here. I've spent a couple of days almost all day long reading back and have learned a TON about oil. Many thanks! Question concerning my Honda Accord V6 I bought it new and have been using Mobil-1 0w-30 for all of my oil changes until on the last oil change I couldn't find the 0w-30 oil and noticed the shelves were replaced with 0w-40 Mobil-1. I even checked three auto-parts stores. I saw the 0w-20 and the 0w-40 but no 0w-30 that I've been using. So I bought the 0w-40 weight and used it. My Accord has 18,000 miles. The oil seems to work good and I've read pretty good things about it here so far. Do you guys think it's okay and if I should just continue with the Mobil-1 0w-40 from now on? I do like the fact that it has a wide range because it's very cold here in the winter but I also drive on trips where it can easily exceed 100 degrees. From what I've learned here the only concern I think I have is if the Mobil-1 0w-40 uses more VI index polymers that can shear down quicker than the 0w-30 oil I had been using prior. Opinions??