Is there any substantial difference running 0W vs 5W, bearing the 0W will flow better upon intial start up ? I've got some bottle of GC and Redline 5W30. Winter out here in NYC averages around 28F. Will I see any real world benefical differences by running a thinner oil ? The oil in my car (brand new) was changed out at 3200 miles and I'm planning to do another soon. It was changed out with Redline 5W30 and I was planning to do another change with Redline and then get start a UOA off that change, come spring. I may go with GC if it will *benefit* my engine since it will flow better in the winter. Love to get some oil gurus feedback or opinion on this.