IMO after 80 miles the rings should have " seated in". If the hone was done correctly. Modern rings and honing method seat very quickly. On the small diesel engines , I would dyno them under a varying load for about 1/2 hr to seat them. Lots of folks use Brad Penn, or Valvoline VR1 is very popular. The owners manual for cars in the 50's, had longer "break in" periods, like 500 miles some even longer.