I would assume the ultra is the superior oil, why it's not Dexos certified? Different additive package? Cost to Pennzoil? Random reasons?
I don't have a GM vehicle! And I'm between using these 2, which is better (better wear protection, cleaning and/or performance)?
Thanks
PS: Sorry if discussed before
I don't have a GM vehicle! And I'm between using these 2, which is better (better wear protection, cleaning and/or performance)?
Thanks
PS: Sorry if discussed before
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