my 2007 chevy silvarado has a loud noise like there is no oil when i first crank it up but after that it goes away
First I would flush the system with Marvel Mystery oil and change the filter and I would try a higher SAE oil as well, if that does not work then you a portion of the chain guide may have broken off this could cause the rattling until it has been coated with oil.
Good call on the chain guide joemom. You should also check and make sure the oil filter contains an anti-drainback valve, some of the oil change places use a cheap version that does not have one.
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