Valvoline VO-40 cut open. Toyota 1NZ-FE 1.5 Yaris. 3k oil change. Torn pleat at base. Sent an oil sample to Blackstone, awaiting results, expecting it to be normal. Unknown oil type or viscosity. First change for a relative. What would cause this, pressure spike, defective pleat or combination or adverse factors ? I have cut open a few filters before, and not seen this. I wanted to cut this open because it was a new car to relative. 121k on unit.