The camshaft position actuator may make a slight tapping noise upon cold startup. This is normal for the first 3-4 minutes of cold engine operation. It just because the viscosity of the oil hasn't warmed up. 5w-30 synthetic or regular is what manufacture does recommend. I doubt its the oil. Check to make sure you are using the correct filter. AC Delco PF61. It has an anti-drainback feature.
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