I had been using Amsoil synthetic for the past few years for my Jeep and just switched over to Havoline conventional on my last oil change after completing the Auto-rx treatment. I didn't feel like paying $5.00-$6.00 per qrt for synthetic anymore plus I hear that Havoline is a really good conventional oil. I was wondering whether or not to switch to 5W30 for the winter. Anyone have the pour point figures on 10w30 and 5w30? Thanks.