Some things I learned from a friend who religiously goes to casa for his cars' PMS
Part of his PMS was to have the fanbelt changed. He goes home checks under his hood and noticed that the fanbelt markings are not even new. From then on, he buys his parts and checks his owners manual for maintenance schedule.
There is a lot of incidents like that here because car dealers either dont have enough time to get the parts or they are cutting cost at the expense of their customers' safety.
IF I WERE YOU, DO THE FOLLOWING:
Highly recommended for new car owners who have issues in which they have suspicions about their car repaired or serviced at casa or any fishy going on in their car after service.
Go to your trusted mechanic or autoshop. You can make this person your "go to guy" for your car whenever you need help. You can watch your mechanic replace/repair your car unlike in casa where you car can be "milked" for parts for use in other peoples' car/unit.
Buy the parts and stock up for the next maintenance interval. Who knows these parts are much cheaper compared to the ones being charged at the casa.
Have the time to read your owners' manual and in the weekends. Please check your radiator coolant level, engine oil level, brake fluid level, clutch fluid level. Check some fluid leaks on your garage, it might be your brake line leaking or your engine oil pan leaking which is very dangerous. Doing these simple things saves you time and money.
Do research about your car models' potential issue in the internet. Some car dealers here in the Philippines are only after for unit sales after that forget the customer. What they fail to see is if the customer comes back because of a fault in their unit they will face the customer whom they sold a possible defective unit. Car dealers often do not know the factory fault of the unit or pretend not to know the units' issue here in the Philippines. KNOWING IS HALF THE BATTLE!
Thanks to RA 10642 known as the Philippine Lemon Law, the customers have power to chase erring car dealers here.
My father said "if you only know how to drive your car but not maintain or fix it you're just wasting time and money" (in tagalog, "marunong lang gumamit"). Common behavior among people who doesnt have time management for their cars. Then they blame casa or other people for a fault that should not happen if they only have taken good care of their cars except for factory fault or lemon units which is a different case.
Some car owners refer to their car as their wife. Seemed to have a longer relationship.
In the U.S. people there are honest about their cars' history. Here in the Philippines, its a big risk to buy a second hand car because people lie and do not tell what they've failed to do in their car. Buying a ticking time bomb is very dangerous.
Take care of your car and you car will take care of you. IS THAT SIMPLE?