Quote:
Originally Posted by ernie9944
If your car is running fine just do a regulor oil/filter change,do not tempered with it & yes 20w50 should be run in your climate. 
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Listen to ernie and the others, do not add ATF or any engine cleaner.
You may make things worse if you remove the light deposits and varnish inside the engine. Your seals may start to leak---are you ready for a complete FOES?
And you should use the OEM Porsche or Mahle filter---maybe K&N, nothing else.
J_AZ