As the title states. I Have some left over second gen Prius 0w20 oil but in GF-4 Spec. Would this be ok to run? Nippon Oil AKA Eneos produces it but it's old and uses Adeka Sakura Moly additive. What would be some detrimental effects with running GF-4 in a motor specked for GF-5. The bottles are red Part 00289-1QT0W. The prius seems to run and run but it's not GDI. Thoughts?
