$100 isn’t really much money in the automotive service world.
I’m going against the majority of opinions here and suggest that the people who regularly service the make and model of your vehicle probably have a pretty good idea of what kind of maintenance is appropriate for your car. Frankly the only baloney I see here is the idea that a modern day car never needs any type of maintenance to keep it running properly. The idea that a service isn’t needed because it isn’t listed in the owner’s manual is misguided.
Recently a woman was bringing in her car with a complaint of a check engine light on, the car would hesitate on acceleration, then start pinging with smoke out the tailpipe, the check engine light would start flashing, then the car would act normal for a bit. The car had 92,000 miles. A 5 minute test-drive with a scan tool before even opening the hood indicated the car had excess carbon fouling in the intake system. We asked the customer if she had ever had a fuel injection and induction system service done. She said no, her dad told her it wasn’t needed. I told her the car should have had 3 of them by now and at this point there was no guarantee that doing it would get the car running right. What exactly did this driver save by not doing the dealer recommended maintenance?