I would change the oil every year, but make sure you use the 507.00 spec. The National deal seems good, you do not have to tell the dealer that the oil has been changed, they would not know or care anyway.
All this computer in the engine checking the oil is nonsence, the long life service is manually set at about 18000 miles.
Don't worry it's your car and you can't hurt it by changing the oil, as long as you use the correct spec.
Have a good time in France, it's a great place and the roads are fantastic. The wine and food aren't bad either!
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