Some things from this thread.
Do not use diesel oils in gas engines. That's just wrong.
If you have to add something to your oil to make it better, buy a better oil. You do not have a clue what you are changing to the parent oil when you do that.
What may look good initially can come back and bite you in the ***.
If it takes more than 10 minutes of driving to seat the rings you need to find a better machine shop. This bullshit of thousand mile plus break in is piss poor machining.
If I found that on my drain plug or in my filter I'd pull the engine and see what's wrong before it went any further.