I have 4K mi on a new Toyota FJ Cruiser, 4WD, MT. I am looking to switch the engine Dino to Synthetic and am considering Amsoil 0W-30 SSO, 5W-30 ASL, 10W-30 ATM or Redline 5W-30. Regardless of the issue of OCI or cost, does anyone have an informed opinion/advice on these oils for this particlar engine? Truck runs primarily in So. Cal region with occasional trips to mts & desert. Thanks.