Lots of modern engines go to 200-350k+ miles using regular store bought filters. Some foreign engines go to 500k to 1 million miles using spin on filters & regular oils. Healthy classics can easily go 100k+ on normal filters.
Good synthetic oils can go to 7500-10k & many still test ok with analysis. Adding 1 qt of new oil to worn out old oil does NOT replenish all the additives.
Toilet paper filters are great, but they are intended for large fleet vehicle companies or over the road semi trucks that do a 500k - 1 million miles in a few years. Go to any car show or drag race event, you wont see any TP filters, or if you do it will be 1 out of thousands once every few years.... theres a reason for that.
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