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    PF66 Filter Comparison - What am I missing?

    I’ve been using the FRAM Ultra XG12447 on my 2025 GMC Yukon with the 3.0L LZ0 Duramax. Based on the ISO 4548-12 testing published by Ascent Filtration Testing, I had viewed the Ultra as probably the efficiency king for this application. With First Brands in liquidation and the future of...
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