Kendall Blend/Motorcraft-251, Quaker State-246, Pennzoil 194, Shell Formula, 74, Havoline 72, Valvoline 1 Castrol, Citgo, Exxon, Mobil5000 <1 looking up uoa on these hard to find any clear benefit of having a high Boron number. Pyb, Havoline, Formula,and Mobil look pretty good at times. Really good question hope more can give their input.