Operator I used to work for back in the 60's and 70's had a similar problem with slivers of the plating either off the cans of oil or the opener/spout getting into the engine oil and brazed mesh screens over the spouts. I don't think it affected the engines but it messed up the SOAP (Spectrographic Oil Analysis Program) results on the JT3D and had the engineers wondering where the metal in the oil was coming from.