Today I did my 3rd service at Proton Service Centre for ard RM150+, but I was shocked when they told me 4rd service (20k) will cost me ard RM500+ (nearly RM600), including changing manual gear oil.

Is it real that 20k service cost that much for manual saga? Another doubt is if I go to Proton Authorized Service Centre (Not the Proton Service Centre) for servicing, warranty will be voided or not?

Since it is 20k service, shud b 10k from now, but why the service sticker still written 5k from now?