Mixing old Mobil 0w-40 with new version.

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Originally Posted By: Crobinson16
Actually neither version has the " certification " my engine requires.
I guess my consern was if they are in fact different base blend's weither it GTL or Visiom? , forgive me for my lack of knowledge on oils, I was under the impression they may be totally different. And I didn't know if that would cause a mixing problem or something else down the road ,Im just not that informed as some.

I've seen your previous posts where you minimize the need for meeting certifications. It's interesting that you care not for that, yet are worried about mixing two oils of the same brand and grade. You might have lack of knowledge on oils but the worst place it could hurt you is one you've chosen to ignore.
 
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