2003 Nissan Altima Engine Rattles?

fix'in to blow...you'll believe it's serious when you are walkin'...changing the oil helped because the new thicker oil helped cushion the bearing as it flops around on the crank shaft. after cooling down ,all the oil drains back into the crankcase and on the initial startup there is no oil to cushion again untill the oil pump starts pumping up the oil. it will not go away but a thicker oil may hide it for a couple weeks...it will not heal itself and the damage could be catistrophic and cause thousands of dollars in damage if you ignore the noise and keep driving it.