Mix 5W-30 and 0W-20

[DavidJones]

Mix away. Your Pilot won't know.

 

[kschachn]

The chances of any negligible effects is so low that isn't worth worrying over. Mix it.

Yes if the oils have passed ASTM D6922 (also part of an API license) then there is a guarantee that the mixture is miscible and will not separate and cause harm. However, that's all it says. It does not guarantee that the resulting mixture will meet any license, specification nor approval that any of the original oils may have held, nor does it guarantee that the mixture will meet any specific winter rating.

 

[wemay]

Yes if the oils have passed ASTM D6922 (also part of an API license) then there is a guarantee that the mixture is miscible and will not separate and cause harm. However, that's all it says. It does not guarantee that the resulting mixture will meet any license, specification nor approval that any of the original oils may have held, nor does it guarantee that the mixture will meet any specific winter rating.

Yup, understood. But it doesn't mean it does not either. We just do not know. But there has also been real world experience where mixing oils has been a common occurrence for a large portion of the community. Their vehicles obtaining very high miles without oil related issues i.e., excessive oil burning, sludge, varnish etc.
Not ideal but not something to fear either.

 

[Allaneddie]

Might be a silly question. Realized I have about 2.5 quarts of unused 5W-30 left over from the wife's late oil-burning Equinox. Thinking the Pilot will be the next one due for an oil change. I'm sure it would be fine, but any problem using up the 5W-30 and using 0W-20 for the rest?

Now you have the latest 2.5W-25. Noone else has that.

 

[Greasymechtech]

,,,

Read the thread

If mixing conventional oil with synthetic, you don't use the OLM or interval for synthetic oil.