What would you guys say is the most shear stable dino out there? also i wanted to get some recomendation for oil and filter on 3 of my vehicles: vechicle 1: 2004 chevy silverado 4x4, 5.3 v8, 115000 miles, with full bolt ons, and stall converter, this is my summer vehicle that i park during the winter months so it only gets run about 6-7 months out of the year here in the summer (i live in pennsylvania btw) the rest of the time its covered up and put away, no short trips, mix of in town and highway driving, i drive this vehicle like i stole it occasionally as well lol, oil changes aprox. every 4000 miles vehicle 2: 1997 chevy blazer 4x4, 4.3 v6, 151000 miles, this is my daily driver and my winter vehicle that i run every day in the winter months here in PA and i also drive this to work most of the time, about 50/50 on highway and city miles, most trips are at least 10 miles if not longer. prefer to do oil changes every 4000 mi. on this vechicle as well vehicle 3: mothers 2008 chevy malibu LT 2.4 I4, 43000 miles, she runs this vehicle year around every day to work which is about 2.5 miles city driving from the house and to get groceries and go shopping which can range from 10-40 miles on the weekends usually. Let me know what ya all think.