We'll I found very small metal shavings in my oil today. 75k on the car and this is the first time I have ever seen shavings. I have always used 5w-30 but the last time I had 20w-50 because I was fighting a high G oil pressure loss problem, but I fixed that with a baffle and new windage tray. Oil pressure is about 25 psi when warm. No knocks. What should I do?