depends. on a UK model Id guess it'd be on 6k intervals. the earlier ones were on 6, slightly later on 9, then new models inc d4d motors on 10k intervals.
The early 6k intervals went A,B,C services a=small, C=major, and the nines went A,A,B with B=major service.
In the dealership we rely on the service book supplied with the vehicle to determine, as its a bit of a grey area.
My guess(since the motors are the same) is that 9k, or 12 months is more than adequate