I like to use SAE 10W-40 in Indonesia, because on sunny day the ambient temperature can reacch 34-38°C, so I need JASO MB to get Low Friction Characteristic, kinda like "Eco Version" or "Resource Conserving" version of SAE 10W-40. Because regular SAE 10W-40 PCMO are kinda like JASO MA to me, and...