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For the 2005, 2006 and 2007 Boxster (987) Porsche had a 20,000 mile oil change interval.
Then for the 2008 Boxster, Porsche states a 12,000 mile service interval for oil & filter.
I find this very strange, since it is basically the same engine. Maybe Porsche knows something more than us.
I change my oil every year, prior to winter storage. I will not put more than 10K miles on the oil. If I drive more than that in my 7-month driving season, I will change it early. I have done 3 oil changes in the past +17K miles. The first one was at about 1,200 miles, again at 7,000 (just prior to winter storage 2006) and then this past fall at about 16,500.
Right now I am running 5W40 Red Line (the past 2 oil changes were Red Line). I really like this oil. $$$$. About $9.50 quart. I plan to use Mobil 1's 5W50 later this year. It is the only Porsche approved 5W50 oil. One problem though! It is not sold in the USA. I can buy it in Canada at Wal*Mart. During one of my next business trips to Montreal, I'll buy some, and then ship it back home via the UPS Store.
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