Mobil 1 High Mileage oil not ILSAC rated - ok or bad fit for the Prius?

[Gokhan]

First, find out what the source of the oil consumption is. Valve-stem oil seals? Rings? PCV valve? Leaks? Valve-stem oil seals: Use 5W-40 or thicker -- makes 2 - 3 times difference. I replaced them on my 1985 Corolla and no oil consumption since. Rings: Viscosity probably doesn't make a difference. PCV valve: Replace it with an OEM one if it's stuck. I've never had issues with it on my 1985 Corolla though. Leaks: Try to fix it.

 

[slickoil]

Originally Posted by Gokhan

First, find out what the source of the oil consumption is. Valve-stem oil seals? Rings? PCV valve? Leaks? Valve-stem oil seals: Use 5W-40 or thicker -- makes 2 - 3 times difference. I replaced them on my 1985 Corolla and no oil consumption since. Rings: Viscosity probably doesn't make a difference. PCV valve: Replace it with an OEM one if it's stuck. I've never had issues with it on my 1985 Corolla though. Leaks: Try to fix it.

How do you determine which it is?

 

[dave1251]

No. Just send it to me it will find a good temporary home in my Silverado's 5.3.