I have the ability to purchase some Shell Helix Ultra 5w40 for about the same price as Mobil 1. So, my question is....is it worth purchasing. I am going to put it in my VR6 Jetta if I do. I thought someone once said that Pennzoil Platinum Euro 5w40 was the same as Helix Ultra, but on the spec sheets on www.shell.com they are different. So, any suggestions?
