hi guys, 3rd gen vios driver here. bought in on jun 2014 and current mileage around 22k. it was about to be serviced and my dad suggest me to go find any workshop for cheaper services but i plan to go vios workshop as it still under warranty i think. so what is your guys' idea?

For me, yes.. and got slightly better mileage after 1st service. Use ron97 will be even significant if you can afford the cost.

For new car, orig is loaded and use mineral oil before reaching 1k mileage.

1st 1k mileage, you got option to use 1) mineral oil (5k)  or  2) semi-synt  (5k)  or 3) full-synt (10k) (if you cash load)
2nd service is 5k mileage. Recommend full-synt before reaching 3rd service 15k mileage.