a general issue noticed over forum is serious confusion about engine oil specs for JDM 660 engine vehicles.
for every brand & body variant of JDM 660 engine ( KEI car )
0W-20 / 5W-30 is best choice. Brand shall be purchased only from verified source.
95% of JDM 660 vehicles are equipped with CVT. The trans-axle code can be verified from vehicle ID pasted over either side pillars of vehicle (most commonly). Only OEM recommended (or fluid meeting the specs) transmission fluid be used for changes.
JDM vehicles have serious disadvantage of ZERO support for NEW engine suspension & transmission parts. So the only source for such parts requirements are scrap yards.