Ok to mix Peak and O'Reilly 50/50?

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I have 2 qts of 5w30 Peak conventional and 2 qts of O'Reilly 5w20 full synthetic. I was wondering if it would be ok for them to be mixed together. Is there any additive clash that I need to be worried about or would you just say mix and go? The OCI will be 3750 at about 50/50 city/highway use. thanks!
 
YOUR ENGINE WILL BLOW UP. Now that we have that out of the way.. You will be fine, any API certified oil should mix without issue. (Sorry I couldn't resist on the first part)
 
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With a 3750 milie oci, you can use any API/SN oil. The mix will be fine.
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