Mixing oils in my 2010 Toyota Corolla

toyota
corolla

#1

Changing my car oil & have 2 1/2 gal of oil 1 Castro & 1 pennzoil can I mix them in my motor till next oil change.
Thanks Mo.


#2

Sure, no problem, as long as they both are the correct oil for the engine.


#3

If you’re a quart low of 5w30, assuming you’re capacity is a hair more then 4 quarts (like my 06 Corolla), even if you added a quart of 10w30, you would likely be creating 6.25w30. During warmer weather, it’s my understanding, that using a thicker while cool lubricant, doesn’t generally create an problems. I believe it’s a good rule of thumb to always use the same lubricant IF YOU CAN.


#4

If both oils are the viscosity recommended by Toyota for your engine, they can be mixed and used.

If not, the different viscosity’s when mixed may have a negative effect on the variable valve timing of the engine.

Tester


#5

For emergency purposes, yes you can as long as they have the same rating and viscosity.