[Sirrotica]

To add to Formulas thoughts, the oil that passes through a OEM full flow filter is not filtered to a high standard. Most filter to 30-40 microns, there are lots of smaller abrasives that still pass through the media unhindered. Low concentrations of these contaminants are fairly benign in overall engine health.

The point where the numbers of the 30-40 micron sized particulate start to add up in concentration is what causes the accelerated wear on internal engine surfaces over time. Frequent oil changes will lessen that problem so the concentration is minimized. Blocking the bypass valve doesn't change the facts that a OEM full flow filter is still only capable of filtering out particulate over 30-40 microns. Frequent oil changes are mandatory to keep the concentrations of fine particulate low with an OEM style filter.

Realistically the short burst of oil that meters by the bypass valve in an extreme situation isn't chock full of sand or gravel and going to take out the bottom end in a few seconds, OEM sees it as a non issue. On the other hand starvation of oil for a few seconds, or an internal media rupture due to a pressure spike that dumps all the previously trapped contaminants out of the filter media, will injure the bottom end almost instantly.

The other alternative is adding extra by pass filter that will remove anything over 5 microns and stop the concentration if someone were to run over on an oil change. The by pass filter also allows you to safely extend oil changes as it adds an extra safety cushion by filtering to a much higher standard over a longer period.

Again, small engines depend upon frequent oil changes to keep the concentrations low the same as automotive engines used 1000 mile oil changes before the addition of any oil filter systems to automotive engines. The addition of oil filters in automotive applications moved the 1000 mile intervals to 3000 miles by at least removing some of the contaminants.

In the end no oil filter, or blocking a oil bypass valve is going to stop catastrophic engine failure by itself. The main job of a filter system is to keep contaminant counts in the lower ranges to head off long term wear until the oil can be changed for fresh oil, or there is a by pass filter system installed that removes nearly all the small contaminants, all the time.

So you can improve the system to filter to a higher standard, or change oil frequently because it's getting contaminated constantly by small particulate that no OEM system can remove. No rocket science involved, just choices on what system you run.