"still have it" meaning what? A vibration? Or you still get death wobble occasionally?
Death wobble isn't a consistent thing. It gets triggered by something, there's violent shaking, you slow down until it's gone, and then continue driving. The way you talk about this it doesn't sound like...
I'd love to help, but you're giving very little to go on.
When it "dies", how does it die? Does it sputter? Do lights flash? Or is it sudden? Is the brake pedal hard when you try to restart it? What have you tried other than batteries? What diagnostics have you done and what were the results...
I've found vegetable oil to be cheaper and easier to change. Viscosity is perfect for this engine and the way the color changes when used makes it clear enough for me to know when it's time to drain and replace without trusting the dumb on-board computer. The "motor oil" branding is just that...