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At 100 degrees C, why is Mobil 1 5W30 more viscous than their 10W30? See https://mobiloil.com/en/motor-oils/mobil-1/mobil-1 Also, which is the more important value to look at: Viscosity at 40 degrees C, or Viscosity at 100 degrees C? Regular vehicle is a Prius, and it doesn't show engine temp...

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...

Can a "High Mileage" oil help reduce blowby? Vehicle is a 2010 Toyota Prius with ~146K, if that matters.

Vehicle is a 2001 Jeep Cherokee XJ with about 128K miles. It now gets driven under 700mi/year. Last oil change was in February 2017 with dino (non-synthetic) 10W30 or 10W40. About 1100 miles driven since that oil change, and it's now January 2019. Any reason to get an oil change? Or wait...

I have a 2010 Toyota Prius that burns about 1qt/1000 miles, so I need to top her off with a full quart frequently (about once per month). Since she only hold 4.6qts of oil, am I effectively doing an oil change every 4,600 miles? Or does it not work that way? Should I stop bringing her in for...

I have a 2010 Toyota Prius. I now get a great deal at the dealership for oil changes (surprising, I know). The Prius takes 0W20, but sometimes I've used 5W20 in the past (full synthetic in either case). I also have a Costco membership, so I can buy Mobil 1 quarts at a good price when they have...

I have a 2001 Jeep Cherokee Sport 4x4 that I only drive about 1K miles per year. I have a mechanic perform oil changes for me, and have them use conventional oil. I've had some people tell me to change the engine oil and filter every 6 months (which is 500 miles), because that's what Jeep...