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I've driven 7K since I bought my 2007 C4S 1.5 years ago and have decided to change my oil/filter prior to the Porsche recommended 15K because of what I've read on this forum. I've read thru the DIY oil change forums but thinking about going thru a dealer since I no experience doing it myself. Few questions: 1) What is the approximate price I would expect to pay a non-dealer for an oil change? 2) I have a case of Mobil 0W-40 but a local guy said he uses his own oil. If he also uses 0W-40 from a different manufacturer or even 5W-40, is it possible to mix; like if I have to add oil can I use the Mobil oil? 3) Do I need to change my oil filter and if so is there a special brand I should consider? 4) Should I have them install a magnetic drain plug and if so how difficult is this (i.e. should I need to pay extra)? 5) Does anyone know any reputable non-dealers near Iowa City for an oil change? What would be the best way to find this out? PCA? Any other questions I should ask the oil change guy that I can't think of?