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First of all, get that 5W-30 oil out of your engine; at a minimum you should be running a 5W-40, and preferably 10W-40 oil not from either Mobil or Exxon as they are the same company. That alone tends to address a lot of start up noises.
Secondly, these engines are well known for having noisy injectors. Get a good stethoscope (any drug store) and try listening to the injectors along the fuel rail at the side of the manifold. We sometimes find one injector that is just carrying on, but it can often be cured by running some Techron with the gas. If that doesn't help, replace the injector.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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