FYI, most SC and proper shop already RM80~100/hour for workmanship.
if you want to change oil i believe most dont want to take RM30 already in big city, except you go to those kampung or urban area.

they need to display the charge based on job's description??

for example:

1. change engine oil, oil filter and etc = RM $$

2. change brake pad, brake oil = RM $$

right??

yeah, same....

even at my friend's workshop

Every workshop should have this price list