actually get out your service book and LOOK at what is required at each of the services. We are talking about relatively young cars here not those with many killometers and worn out parts.
They don't actually DO much. it is inspect this and inspect that. most service work is replace a filter or two and the fluids. maybe adjust the handbreak.
they dont actually adjust the tappets - at least that is not included in the base service cost. they just 'listen' to them.
on the bright side modern motors are particularly reliable and don't need much tinkering unlike older petrols which needed 'tuning'. Thank God none of my cars have dizzies and 'points' anymore and i pretty much feel the same way about carby's. thank the lord for EFI.
if you think the dealer is plugging in to 'auto upgrade software' without reason at a service interval you are kidding yourself . They check to see if there are any outstanding faults and that is about it. from info on this website ECU upgrades take a long time.
i agree that dealer servicing is well overpriced and they know it and are not ashamed of it. it is how dealers make money. they pay apprentices $5 and hour and charge you a fortune. just like car manufacturers make very little from new car sales. they make it from parts distribution. i was reliably informed that ford make less than $1000 on a new falcon - not much for a very high risk manufacturing industry.
why do you think they take the risk of 'extended warranty' if you only service with them? it is because that risk is being offset by the extra profits they make during the servicing. otherwise they would offer the 10 year drivetrain to all cars that have been serviced irrespective of a dealer or other licensed mechanic doing it.
but you are right that if a 'problem' is occuring and particularly if it is software related then the car branded dealer is the way to go. my old MK triton had issues witht the front diff locking in an my mechanic wasted his time and my money not fixing it. mits fixed it straight away as it 'was a characteristic' of the car and they knew what it was from previous vehicles.
i personally have been told by my local mits service dept that if i use them for the 15k intervals and get the oil changed every 7.5k elsewhere they will still cover the warranty. so that is what i am doing.
This car is like a bad drug habit. It is taking all my money and time, my family are concerned, but new mods just feel sooooooo good.