Wow! A Yupper accent SOO thick, it actually translates to print.
Am I to understand you've rebuilt this motor last year?
Pulled and cleaned the trap while you were at it?
Add a Norton or Trident oil filter. Detergent oil will probly
double the miles to fill the trap. A filter will quadruple (or more)
the amount of miles.
And 20/50 oil is what you should run.
At 11k on the clock. My trap was about 60% filled. It had never been
pulled, so it spent many of those miles with non detergent oil.