Can we mix same engine oil grades but from different brands, ie(castrol and pennzoil10W-30)?

Question:
Both lubricants are the same grade 10W-30 but I need to add more oil since its low(on Castrol) and I can't find that brand at any of the local stores. I have pennzoil from when i did the last oil change of the same grade.

Answers:

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As long as they are both the same classification, yes, brand doesn't matter.
Classification isn't a reference to the grade, but to the classification shown on the container.
As long as the oil is classified as "SJ", or "SL" or "SM" it is intended for a gasoline engine, or spark fired engines.
The other classification designation is "CJ", or "CL", or "CM" and refers to compression fired, or diesel.

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Happy Motoring

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not the best idea but really will not hurt..any oil is better than no oil

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It's not a problem. But I would make sure both oils meet the same API rating.

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Yes, you can mix them safely with no ill effects at all. Oil companies won't tell you this but having been in the industry for so long, all motor oil is the same base stock, the only difference is the additive package each company adds to the base, they all have their secret formulations, mostly its advertising to separate themselves from the crowd but in reality they are all the same.
I would not mix a synthetic with a regualr however, but regualr to regualr, no problem.
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