Mine is a 2011 and I chose to change the oils at 6500km. No special reason for that distance but didn't want it to get to 10,000km on the first lot of oil because of the microscopic metallic stuff which is better out than in. Next oil was at 14,000km.
The 3000km "service" is just a tyre kick.
They should, check the/all oil levels, wheel nuts, body fastenings, other fluid levels including brakes too. Brakes and clutch, if fitted, are easily seen but many aren't.
If from factory, a level is down for some reason, then the pre delivery and first service checks which aren't done won't find the deficiency and if someone then uses the vehicle for long distance or reasonably heavy towing, then a problem could develop and cause trouble or failure. Rare, but not impossible.
For me, because it has a filter, the engine is the most protected and the diffs and gearbox (manual) and transfer aren't and they too like particle free oil. I don't think they will fail but it can't be as good as clean oil is.
If the oil specs are as specified then service shouldn't affect the warranty, maybe best done by a qualified person who can legally verify the work. I don't know what dealers are willing to accept.
Will send a PM.