shavings

Just changed my oil again, 3rd time in the last month- I'd been trying out different oils (rotella, mobile 1, and delo400) and have been dealing with a grinding starter clutch on and off... I noticed metallic shavings in the oil drain pan and was thinking it's probably caused by the starter...

500 miles after changing my oil I had to drain it to replace the pickup coil. Noticed small gold shavings and a material that looks like sand. The gold shavings are either brass? or overheated steel. The other material looks just like sand, some dark pieces, some clear pieces. My engine is...