At 30,000 miles switched to Amsoil 15/40 Syn
Alum. 2
Iron 27
Copp 4
Tin 0
Lead 1
35,000 I put on Amsoil Dual by pass filter system
Alum 2
Iron 18
Copp 3
Tin 2
44, 000 changed oil,new Amsoil 15/40 Both filters changed
Alum 2
Iron 45
Copp 5
Tin 0
Lead 7
50,000 sampled oil. Changed full...