why are the lifters rattling in the engine

2003 CHEVROLET TRUCK
168,000 MILES
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GUNSHUFFLER0378@YAHOO.COM
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after i run about 100 miles at 75 mph . the next morning when i start the truck the lifters rattle very loud for about 4 minutes. I can drive every day at 60 mph and it never rattles.
Sep 2, 2011 at 7:26 PM
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JACOBANDNICKOLAS
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When it happens, you need to check oil pressure with a mechanical oil gauge. It will screw into the sending unit port. See if the pressure is low. Also, make sure the oil isn't contaminated with coolant or fuel.
Sep 2, 2011 at 7:30 PM