DS7 Questions Service and oil change – 225 petrol

Hello, some questions, where I find in the www no answer, before the leasing: – which oil change interval has the 225 hp petroler and what does it cost? – which service interval (small / large) has the 225 hp and what does it cost? – can you dress up the open steering rod, so it doesn’t work! – is the fake exhaust also available at the 225 beziner, have read something contradictory in the forum? – are there current leasing offers that have a good LF? Where did you buy, there is only from selected stores in a few centers? Look forward to lots of info, as it is definitely a variant for me, at the next order… Thanks & VG