There is a reason there is a filter on the oiling system. It catches the wear particles and general junk that enters the oiling system.
I use 15W-50 Mobil 1. Great stuff.
If you have particles ( and they are not huge ), it could mean several different things.
If you are hammering the throttle, I am sure you are going to "age" the engine faster than if you let grandma drive it...well, maybe grandma.
Check it again in 1000 miles and see if you get more metal.
Just my opinion.
