Is Mobile 1 High Mileage oil a bad match for the Prius?

Any high mileage oil is bad for any car! It swells the seals, which in turn will make them fail sooner.

 

Mobil 1 EP High Mileage versions do have ILSAC ratings...

 

I use the mobil-1 fuel efficient 0W-20 for hybrids/electrics. Way better than stock toyota oil in my opinion. Lasts longer too.

 

Sorry to tell ya, but Toyota oil is Mobil 1.

 

Its made by mobil-1, but they're not the same.

 

Only difference is an additive package that Toyota spec. It’s still Mobil 1. I use Mobil 1, 0W-40 as it’s better then 0W-20 which is water and that 0W-40 is the only true synthetic oil made by Mobil.

 

Well, that additive package you're talking about seems to be useless because my prius runs better with mobil 1 0W-20, than the stock oem toyota oil. My engine is quieter with mobil 1 and it lasts way longer than the toyota oil. Even my acceleration and braking seems to be smoother. Believe it or not the prius oil has an effect with our braking, or should i say the engine? They all work in one relay.

 

Addictive package is for protection and prolonging the engine from wear, in no ways it's supposed to improve performance.

 

How do you figure an oil last longer? It should be changed at 5K miles period. Oil and braking has no relationship, if you mean deceleration? It would have very little impact.

 

High Mileage oil has additatives that swell the the seals and in doing so, degrade the seals overtime. When you have a leaking seal, the only real fix is to replace it.

 

Walmart has 5-qt jugs. Buying multiples saves some, ie 3, 6, 9, or 12. If you get 15k miles within 1 yr then you save by not having to change oil as often. You’d need to switch to a higher capacity filter such as Fram Ultra or Mobil 1....

(I’m afraid I didn’t do the math on whether 60 qts is the best deal)....

 

That's the one scenario that makes sense, especially if you've got an oil guzzler at the outset: buys you some more miles on the engine.

It's strangely underexplained on the high-mileage oil bottles. They seem to make the implication that this is the oil for you, over a certain number of miles, and NO mention of the seal-swelling. Borders on deception.

Years back I can recall looking at a bottle, wondering if I should be using it. This is with cars with very modest oil consumption.

 

Oil filter housing determines capacity.

 

Oh no Red line oil is only rated Dexo Gen 1, not Gen 2. It's not a match either

 

As Mendel alluded to it is somewhat confusing.

I followed Gen 3 recommendation and looked up 0W-20, not the 10W-30 that you are using. Mobil doesn’t make an EP High Mileage 10W-30 I’m afraid. If it were my car and it passed the 75k mi point I will consider a high mileage formulation vs switching to a thicker viscosity, given the two choices. Currently I am changing annually using 0W-20 Annual Protection. Just my humble opinion.

As far as I’m aware the Mobil, Fram, or other extended drain filters use synthetic filter media which can hold more dirt without clogging. (As I know STP makes a 15k mi filter, but Mobil and Fram both make a 20k mi filter. Spec on the Fram Ultra note 20 microns up, I believe Mobil 1 Extended Performance filters (newer version with “A” appended to the part number) note 30 microns and up. I collected a bunch of the Mobil 1 filters for an old Mercedes in the household so I will be using those, otherwise I’ve switched to Fram Ultra, because I noticed this subtle difference...

 

What Mendel said made total sense in a nut shell.

To rephrase what he said if your engine seals are deteriorating, rings are not functioning as usual, putting high mileage will buy you sometime to keep driving until they completely give up. And if your not engine oil inclined/knowledgable, the "high mileage" label might trick you into buying high mileage oil because your odometer says so.