I don't think that Idemitsu is the one distributed from HPM (Indonesian Honda). Usually, in Indonesia, they're working with local oil producer (like Pertamina). But, it won't be a big matter, as long as the specification meet the needs, the oil will be safe to use. And I use this brand too, but with higher viscosity (10/30) . This brand was globally known as oil producer with good reputation.
i think so, pertamina oil or rather be should be called fastron isn't bad rep and quality oil, ACTUALLY it is good oil and it is uses by Pertamina team at Blancpain Races in the Huracan GT3