what is the normal cost for 2 year maintenance on 2012 porsche cayman
Normal is different for everyone. At 10K miles, you looking at an oil change in the year. Once you get more mileage, the cost will increase. hard to say exactly how much. Depends on if the dealership, local garage or yourself will do some of the labor. Have a few thousand handy for the unexpected.
No more than any other car if you avoid the stealerships. Find a reputable independent shop. Shops that do racing upgrades are really good for all your needs. Check with the local Porsche owners group in Panorama magazine for recommended shops. If you're mechanically inclined, parts are easily available on line. Don't get ripped-off simply because it's a Porsche.
Why would someone say "hard to say how much"? It's super easy - call your local dealer. Porsche has a simple annual maintenance schedule: Minor, Intermediate, and Major Service. 12 months is Minor for $695, 24 months is Intermediate for $1395, and I haven't had a major yet, but I think it's around $2200. Ask the dealer what is included, but all include oil/filter change. Intermediate also includes brake flush and cabin air filter. My dealer includes wiper blades at each service.
That's why they are called "Stealerships"! If you can't turn a wrench, go to an independent shop that services Porsches and have every thing done, using Porsche recommended fluids, when it's called for. I change my oil/filter for $55 using Mahle filters and 0W-40 Mobil-1 oil as Porsche recommends in my 996. You do the math. A brake flush shouldn't cost more than $150 max. You can do it yourself for the cost of a liter of recommended (ATE) fluid and a $30 pump. You've paid for the "free wiper blades" over 50 times by now.
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