1996 Cherokee 4.0 87,500 miles No leaks, no consumption at all. I bought my pig in North Carolina, brand new. Always run Castrol 10W30. On the coast there it's HOT in the summer, and in the winters it can get pretty chilly for a while(sometimes in the 20's F). Now I'm in Seattle and I guess reading all you guys' posts about changing viscosities has me a bit paranoid. Owner's manual says 10W30 for temps donw to 0*F, so that's what I always use, and change every 3K. So, soes anybody think I should be changing to 5W30(yuck) in the winter here? Or maybe going to a less restrictive filter than the PureOne I now use? Or both? Or just shut up and drive? Thanks.