Which oil to top-off with?

[oilburnin]

I have 3 different opened bottles of oil lying around so I'd like to use one of them up, even though none of them are perfect for this situation.
Castrol Activo 4-stroke motorcycle synthetic blend 20W-50
Rotella T6 full synthetic 5W-40
Pennzoil high mileage conventional 10W-30

Kia Soul did an oil change 2,000 miles ago with Pennzoil regular synthetic blend 10W-30 and burned half a quart, so I need to choose which half quart to add for the last thousand miles until the next oil change. Total capacity is 3.8qts.

For these next thousand miles it'll be 85 degrees most of the time I'm driving, although today was 100.

Thanks guys

 

[Chris142]

10w30

 

[The_Jeff]

Put Pennzoil 10w30 in your Pennzoil 10w30.

 

[Legs4Arms]

No brainer here...

 

[kschachn]

Use the one that will help melt that plastic straw out of your converter. The one you saw with the borescope.

 

[JavierH19]

uhhhhhh that one!

 

[GSCJR]

Use the one that will help melt that plastic straw out of your converter. The one you saw with the borescope.

I'd love to hear this.

 

[SilentType]

Any of those are fine for top off.

 

[donnyj08]

The 10w30 HM…any will work, only one makes sense imo.

 

[hemitom]

Use the one that will help melt that plastic straw out of your converter. The one you saw with the borescope.

Come on man !
you know the pistons will melt before the straw.

 

[melk]

Mix in a little bit of each one!

 

[Hirev]

21.33 oz of each of the 3.

 

[CleanSump]

Eaney, Meaney, Miney, Moe.
Don't let BITOG ever know.

 

[4wd]

Eaney, Meaney, Miney, Moe.
Don't let BITOG ever know.

Yep, won’t let them know when I mix two lubes either

 

[4wd]

I always figured staying with the same brand - and closer on viscosity - ups the likelihood of same/similar additives …

 

[Japanese]

Rotella T6 full synthetic 5W-40
Pennzoil high mileage conventional 10W-30

Either of these two would be fine.
The other one is motorcycle oil and may cause some issues of your catalytic converter.