So my 2007 Camry 2.4L with 90k miles burns about a quart of oil every 3k miles, which isn't that bad for the 2AZ-FE Toyota engine (and well shy of the 1.2 quart per 1,100 - 1,300 mile consumption test for the rebuild). I got the car at 60k and ran 0W-20 Pennzoil Platinum in it for about 25k miles. Last oil change I switched up to 5W-20 PP High Mileage for the seal conditioners. Now I am trying to determine whether to go up to 5W-30 PP High Mileage or stay at 20.
The reason for my indecision is the nature of the problem with the 2AZ-FE consumption issue. Given my understanding of the issue (the oil return holes in the piston rings were milled too small and become clogged), it seems to me that increasing the oil viscosity would allow less oil to pass through, resulting in greater burn off. However, it seems that many people with this engine utilize the 30 viscosity oil over the 20 anyway. I don't think my consumption has increased using the 20 viscosity PP, but if it will potentially burn less per OCI with 30, then why not?
Is my thought process on this issue wrong?
The reason for my indecision is the nature of the problem with the 2AZ-FE consumption issue. Given my understanding of the issue (the oil return holes in the piston rings were milled too small and become clogged), it seems to me that increasing the oil viscosity would allow less oil to pass through, resulting in greater burn off. However, it seems that many people with this engine utilize the 30 viscosity oil over the 20 anyway. I don't think my consumption has increased using the 20 viscosity PP, but if it will potentially burn less per OCI with 30, then why not?
Is my thought process on this issue wrong?