- Jul 10, 2018
- Southern California, USA
Have been using Mobil 1 0W-20 on the 2010 Prius with ~146K. Was considering switching to Mobil 1 High Mileage 10W-30 in the future due to oil consumption issue. Then noticed that the only spec Toyota requires for the Prius is an ILSAC rating (manual doesn't specify which one), and that none of the Mobil 1 High Mileage oils have ILSAC approval. Does that mean the oil is a bad fit for the Prius, and that it would be better using a different high mileage brand that is ILSAC rated?