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 Interesting information about the 5 classes, never knew that. What class would Swepco 306 be ? 
	And, how can one tell which class an oil belongs to from looking at the container ?  | 
		
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 I do run the Castrol 10w40 in the Boxster. All my other cars run the oil called "On Sale".  | 
		
 Porsche has issued two TSBs on oils.  One lists a whole bunch of oils by the country to be used in.  The other specifies SAE 0W-40, 5W-40 and one or two 5W-50s. 
	Make sure API SL minimum, and ACEA A3/B3. I used Motul 300V 5W-40 last year, a Group 5, maybe 4 oil that is very expensive. I'm going to Castrol Syntec 5W-40 this year to save some money. OBTW LNE also makes a magnetic drain plug that I will be checking with upcoming annual change.  | 
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