In the discussion about wear rates for differing oci's, many statements were made about why mathematically you might see certain results.
I thought I would simulate what happens if you do 5000 mile vs 10000 mile oci's and sample at the end of the oci's. Break in wear is assumed to be 200ppm and completed at 5000 miles. Ongoing wear is assumed to be 10ppm per 1000 miles and residual oil in the system is assumed to be 20%.
With these assumptions, the conclusion is that a UOA performed at the end of a 5000 mile oci should show lower wear per 1000 mile than those performed at 10000 mile intervals. The reasoning is simple. More oci's mean more flushing of the break in wear that remains in the system as part of 20% oil leftover after an oil change.
If I recall correctly, dnewtons UOA trending across the same engines showed longer oci's had less wear per thousand miles in longer oci's.
I thought I would simulate what happens if you do 5000 mile vs 10000 mile oci's and sample at the end of the oci's. Break in wear is assumed to be 200ppm and completed at 5000 miles. Ongoing wear is assumed to be 10ppm per 1000 miles and residual oil in the system is assumed to be 20%.
With these assumptions, the conclusion is that a UOA performed at the end of a 5000 mile oci should show lower wear per 1000 mile than those performed at 10000 mile intervals. The reasoning is simple. More oci's mean more flushing of the break in wear that remains in the system as part of 20% oil leftover after an oil change.
If I recall correctly, dnewtons UOA trending across the same engines showed longer oci's had less wear per thousand miles in longer oci's.