Looks like Idemitsu discontinued their High Mileage 0W-20. Guess that's why it was so hard to find lately.
They have some new IFG line. "Introducing the all-new IFG Series of engine oils precision-tailored to provide peak performance thanks to cutting-edge nanotechnology. Idemitsu now provides three specific levels of performance and protection. Our technicians work closely with engineers from OEMs such as Honda, Mazda, Nissan and Toyota, and we apply those insights to our engine oils."
A leader in high-quality full synthetic oils, engineered for maximum performance
www.idemitsulubricants.com