I have learned the expensive way of bringing your own oil for service. They have to entertain you because they want the business. However, they will make a note on the service record booklet 'Own oil".
When it comes for warranty claim, they will show you your booklet that you didn't use their oil & you are to prove that it was not due to oil used that damaged the warrantied part. They will also print out the service record on their computer & show you that they cannot help you due to "Outside" oil used.
It applies also to PETRONAS oil purchased at petrol station. They will claim that no doubt you bought the oil from PETRONAS, you could have diluted or replaced with other oil before bringing to Service centre.
So, for me, I always buy the cheapest oil available from them & change later to my preference during the warranty period.
No one asked us to select or buy their vehicles.

Anyone has the original horns to let go cheaply??

For another car which has a unit spoiled.

Just take the 11k discount. I had to fight with my SA in Nov last year just get my delivery. So stocks shud be DEC ones. Six mths 11k..... Whew