Is a porsche more exspensive than a bmw as far as maintence

Hello, 

Thank you for writing in. If you generally comparing brands, you are not going to see a huge difference in maintenance costs. Both Porsche and BMW are German manufactures, and they both require special certifications to work on them. This means that you are going to be paying more in labor costs, as well as for parts, when compared to American and Asian manufactures. Any dramatic price differences are going to be due to the model and year of the vehicle, as well as what is being repaired. 

Regarding your 2010 Porsche Cayenne, 

Yes that vehicle would be more costly than a BMW to maintain in regards to parts. 

In general, yes.  But it depends on which model BMW you are considering.  The X6, and the M-series vehicles tend to be very high on maintenance.  It also depends on whether you are talking about a new vehicle or used one. On a new vehicle, you can you do the maintenance correctly from the beginning and potentially reduce repair costs down the line. If you're buying a used one, it depends on how well the previous owner took care of the vehicle. Many European vehicles have not been maintained at sufficient oil change intervals. This leads to significant repair costs down the road, whether you're talking about a BMW or Porsche.