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5W30 synthetic oil

Engine

Model: 996, Year:2004, Mileage:33,000, Type of use:Street use only
question for Joel Reiser:Is Porsche advocating 5W30 instead of 0W40 oil for 996s?I was at the Coronado speed fest this past wk.end.Talked to a Motul rep who told me. also said that engine clean added to old oil and idle engine for 15 min. was good for cleaning the engine every other oil change.What is your opinion? Does Porsche advocate this/ GeorgePS my wife sent the question about the A/C but put the model as 966 instead of 996. car only has 33,000 miles on the odometer. It is a 2004 cab with tiptronic.Must I evacuate the system or could I put in a can of refrigerant?thank you George

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