Suzuki Swift NZ 1000km inspection costs + engine oil

Hello, I have had a Suzuki Swift NZ (94hp, 30 years edition) for almost 2 weeks. The car is a new car and an EU import. This week the 1000km inspection was due. I had an appointment with a Suzuki contract workshop today. However, some things seem suspicious to me: – I paid 191€ for the 1000km inspection. It seems to me that this is quite high, on the Internet I found 45€, once 60€ and 90€. On the invoice are beside small items (Federschu) tz, small material, oil filters, sealing rings, copper paste, lubricant) two big posts: the assembly of the copper paste (“KUP” with 70€ and 4.5l motor oil to 78€. Isn’t that a bit high? What does it have on it with the copper paste? – As oil a Castro GTX 10W40 has been filled in. A 5 litre canister of it I get as a private person for 21€ from the internet. According to Suzuki, however, a 5W30 is required for the Swift NZ alone. Or did I get the wrong information here? The price of 78€ for 4.5 liters seems to me to be very high here as well. I would rather buy a Mobil1 0W40 New Life myself and let it be filled in. How do you see it? Thank you and many greetings, Dirk