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First, Are you sure you are using the correct oil filter (Mahle 142 or Porsche) and it is tightened properly?
Second, If your oil pressure gauge is not reading at least the minimum pressure, then don't run the engine until you figure out why.
Get oil pressure resolved before going any further...
Tappet noise on startup is normal for a car that has been sitting.
Rule of thumb: Oil in coolant is from a bad oil cooler seal. Coolant in oil is from a bad head gasket.
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