Metal in oil
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.