Yup, it's one of my New Year's resolutions. Here's my stable: 2002 Acura MDX 19k 2000 Audi S4 117k 1999 VW Jetta 2.0 65k 1993 Isuzu Trooper 128k 2003 Kubota BX22 Diesel tractor 400 hrs. I'm currently using a different oil for each car and while that my produce optimum results, it's just a PITA stocking all the different oils. How about I go with Amsoil 0W30 or GC in the Audi and Acura and then use Delo 400 or Delvac 1300 15w40 in everything else? Would the 15w40 be to thick in PA winters? Happy New Year!