Is mixing different brands of motor oil ok?

[isasir]

I have 3 bottles of Castrol 10W30 and 3 bottles of Valvoline 10W30. Could I use both of them the next time I change my oil, or should I just buy another case of one of them for consistency?

 

[Kremlar]

I'd use both of them.

 

[StageLeft]

I think you're fine.

 

[mandala]

Are they both conventional (not synthetics or anything strange)? If so, I see no reason why you can't mix them.

 

[Vic]

As long as they're the same weight (and it appears they are), you're fine. You could even mix syntho and dino if you had that/wanted to. If you're still under warranty, check your manufacturers' recommendations (just to be safe).

 

[isasir]

Originally posted by: Vic
As long as they're the same weight (and it appears they are), you're fine. You could even mix syntho and dino if you had that/wanted to. If you're still under warranty, check your manufacturers' recommendations (just to be safe).

Yeah both are regular motor oils. I had bought a case of Castrol awhile back, then picked up some Valvoline cuz that was on sale, and the 3 bottles are the leftovers from each of those cases. Both are 10W30, which is what's recommended for my car. The only difference is just that it's 2 different companies.

 

[Vette73]

You will be fine. Over 90% of all motor oil is made by Exxon/Mobil. Castrol and most other "Oil companies" have no true refineries, so they just buy their oils.

But I will say, castrol has the best marketing, and charges for it.