Of course you meant purely subjective...Great breakdown. Good oils and good filters! Big fan of Royal Purple products. I typically use their ICE(Coolant enhancer), and Octane booster when I need it because of access to lesser fuels.
I have used Ceratec by Liqui Moly in the past. Good results on my VW TDI's when I did oil analysis. Haven't typically put it in my Fords, because of less extended intervals for change. I have been using FR3 by HotShot Secret after oil changes in my 2020 Expedition, my Previous 2020 Explorer ST, and my Current 2021 150. It is fairly cheap when broken down per oil change, and I have seen some promising analysis of it. Is it helping, well without an analysis, it is purely objective. The Expedition seems quieter on cold startup once it is added to the oil. Again, purely objective.
Objective vs Subjective
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