Hello All. Just received results back from a engine oil sample on my 1991 350sdl

The oil is Shell Rotella 15w40.

Everything is normal except that potassium is at 30 ppm.

test results:

wear metals: Iron 53, chromium 8, lead 4, copper 4, tin 2, alum 4, Nickel 10, silver 6. Boron 286, Na 6, (additives: Mg 25, Ca 2721, P1379, Zn 1435 and Mb 2) Physical analysis: Fuel: neg; Water: neg; Gylcol Neg.

The car's last oil change was Dec 2002 at 89059. I purchased the car in oct 2003 at 89177 miles. Yes, less than 200 miles in the year. The owner passed on in 01-2003. I put 2000 miles on the vehicle and had the oil sampled. Antifreeze test is negative.

No oil needed to be added in 2000 miles.

TBN at 8.50; viscosity 15.3

any suggestions or comments. I am leaning that because the car sat for nearly a yearly, that could have something to do with the high K levels.