All the 20wts seem to be excellent so far. I was thinking of buying the Havoline/MC or Amsoil. After reading about Havoline switching to Group I baseoils soon, confirmed by two CVX reps, I'm leaning more towards the MC or Amsoil. However, I did come across quite a bit of 5w-20 Havoline from July/August months. I like the fact that the MC is a Group III based oil but I like the add pack of the Havoline. My wife's Focus doesn't get driven all that much anymore and I might switch her car over to one of these. I might even run them in my car once my 0w-20 supply is out. Thoughts?