This engine is on my Craftsman 2800 PSI pressure washer. Being somewhat skeptical of "never change oil engines" this is my 2nd oil change. It is mainly used to clean my gutters twice a year, not a lot of use. The Briggs factory oil came out rather silvery with swirls of silver matter after around 5 hours of use. I refilled with STP SAE 30 HD from Autozone. This time it didn't didn't have swirls of silvery matter, same 5 hours of use, BUT there are lots of tiny specs of silver in the oil. And it looks opaque grey/green. I tried attaching the picture of the oil but "Bob" is not allowing it, keep getting a sorry message. I've attached previously from my Dropbox without issues. I like a lot of life out of my equipment so I'll continue to change the oil.