# Mixing oils in my 2010 Toyota Corolla

**URL:** <https://community.cartalk.com/t/mixing-oils-in-my-2010-toyota-corolla/118284>\
**Category:** Maintenance/Repairs\
**Tags:** corolla, toyota\
**Created:** [May 29, 2018, 2:12pm UTC](https://community.cartalk.com/t/mixing-oils-in-my-2010-toyota-corolla/118284 "2018-05-29T14:12:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![MoisesGarcia](https://avatars.discourse-cdn.com/v4/letter/m/94ad74/32.png) [@MoisesGarcia](https://community.cartalk.com/u/MoisesGarcia)\
**Post date:** [May 29, 2018, 2:12pm UTC](https://community.cartalk.com/t/mixing-oils-in-my-2010-toyota-corolla/118284/1 "2018-05-29T14:12:58Z")

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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.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [May 29, 2018, 2:15pm UTC](https://community.cartalk.com/t/mixing-oils-in-my-2010-toyota-corolla/118284/2 "2018-05-29T14:15:32Z")

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

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**Author:** ![MarcoPolo1](https://avatars.discourse-cdn.com/v4/letter/m/8edcca/32.png) [@MarcoPolo1](https://community.cartalk.com/u/MarcoPolo1)\
**Post date:** [May 29, 2018, 5:51pm UTC](https://community.cartalk.com/t/mixing-oils-in-my-2010-toyota-corolla/118284/3 "2018-05-29T17:51:41Z")

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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.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [May 29, 2018, 6:31pm UTC](https://community.cartalk.com/t/mixing-oils-in-my-2010-toyota-corolla/118284/4 "2018-05-29T18:31:43Z")

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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

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**Author:** ![monkarl](https://avatars.discourse-cdn.com/v4/letter/m/919ad9/32.png) [@monkarl](https://community.cartalk.com/u/monkarl)\
**Post date:** [May 31, 2018, 7:17am UTC](https://community.cartalk.com/t/mixing-oils-in-my-2010-toyota-corolla/118284/5 "2018-05-31T07:17:32Z")

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