Have you done any tests on the Fram Ultra. I haven't seen any reviews that show the Wix XP as being superior to it.Im not here to argue about who is better but working in labs doing run test on oils and filters has let me see the real world data. I will stick to the Wix xp series.
I've used Fram ultras for over 10 years and Motorcraft for 20 years prior. Never had any oil or engine related issues either way.
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