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Tony's correct on the oil flow but if the oil is cold and the viscosity is thicker because of it, it will have more resistance trying to flow through the filter element and the oil filters internal bypass valve will be pushed open and some unfiltered oil will bypass the filter element and drop into the oil tank along with the dirt and metal filings.
...then the pressure side of the oil pump will suck some of them up with the oil through the large S hose and pump them into the oil galley so they can become embedded in the main and rod bearings lead babbit layer scratching the crank journals, some will clog the piston squirters and the rest goes down the oil galley to clog the cam spray bars, eventually destroying the cams, rockers, valve guides and valve stems from lack of oil spray.
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