As we know, the Scat Pack Challenger’s OM recommends Pennzoil Ultra Platinum 0W-40. The issue I'm having is that Pennzoil indicates that this weight is sold at all automotive parts retailers and Walmart. I checked all parts stores in my area and no one has this weight. Walmart had a shelf tag, but has yet to have it on the shelf. Only one retailer, a local O'Reilly's finally told me they could order it, but a case was expensive! Pennzoil told me to call their distributor in our area, so I called and she had no clue! After a long discussion, she finally said she could order it from Atlanta, GA, but it would take about 3-4 weeks and it was also expensive... Seriously? I live in North Carolina, so it shouldn't take that long if I had decided to drop that dime. Pennzoil even offered a rebate on the 5 quart container of Pennzoil Ultra Platinum 0W-40 and Amazon didn't even have it – neither did anyone else! I’m unsure what Pennzoil is trying to do with the availability of this weight oil. I’ve been ordering it from Amazon as that’s the best price I can get so far. I had rather not change the brand as it's been doing well for my car. I know ordering it has several advantages including the availability and convenience of the 5 quart container. For anyone using this brand and weight, are you having the same availability issues? Thanks for your input!