With most engines with age the lifters in the head will start to fail. If it quiets down as it warms up this is due to the Viscosity of the oil changing. Trying going to a higher milagr oil and that should quiet it down. This will also solve the low oil problem. If the noise persists at the same intensity then it might be time to replace your lifters. Hope this helps.
Sounds like a lack of oil to the cylinder head.
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