>" The 70s cars I remember as more cantankerous but if taken good care of (which was simple because the cars were simple) they would as well."
What's more complicated about taking care of a car today? In fact it's easier as the number of maintenance items has gone down
Cars still have oil, oil filters, transmission fluid, air filters, maybe differential fluid, and spark plugs
Car NO LONGER have distributor caps, spark plug wires, power steering fluid[3], and timing belts. Finally you don't need to adjust the timing, the throttle cable tension, for FWD cars [8] you eliminate the need to change differential fluid, and you don't need to "lube" anything.
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> Cars from the 80s routinely went well over 100k
That heavily depends on the brand. American cars were piles of garbage in my opinion and I'm sure I could find some source to support that. You are right about Japanese cars and that was a new phenomenon at the time. Here's a NY times article about how cars are now (in 2012) lasting more than 200k miles.
https://www.nytimes.com/2012/03/18/automobiles/as-cars-are-k...
My friend had a 91 Civic that lasted for about 250k but I had multiple GM cars (86 lesabre, 91 corsica, 88 6000) where either the transmission went or bent valves (exceeding the cost of the car at the time in the late 90s when I owned them) without even getting to 120k.[6] Anecdotal but again Honda and Toyota were so popular the US government made Japan limit the number of cars coming in.[3]
https://www.latimes.com/archives/la-xpm-1987-01-28-fi-1076-s...
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Newer cars are less complex in key areas. I quickly mentioned this in the first section but there's more:
- Spark plug wires are gone. Since they carried high voltage from the distributor cap they needed thick insulation and that insulation would crack due to heat cycling. once small cracks appear it would arc to the engine or other wires because of the high voltage. Now we have ignition coils which aren't considered a maintenance item (they last at least 100k but really more depending on use)
- No more distribution caps (due to ignition coils). Caps were a maintenance item
- No more power steering fluid, and power steering pump because of EPS racks. This also eliminates the hydraulic lines
- Throttle by wire which eliminates the throttle cable that would get stretched out and sometimes break. This also allows for cruise control without the use of vacuum lines [9]
- In the past cars have timing belts, timing belts can break and if your engine was an interfere engine the valves will contact the piston causing a massive repair bill. Today almost every car has a timing chain which lasts significantly longer to the point where it's not a maintenance item.[1]
Starting the 80s we got OBD 1 then later 2 which provides sensor data. This allowed you to see the real symptom of the car instead of the apparent one. For example, car has a rough ideal but really it's running lean. Besides the massive performance and efficiency increase because the ignition timing can be based on the exhaust contents , temp, air flow levels, etc it also makes it easier to fix things by providing data on how the engine was operating. Today cars have even more computer diagnostic systems to help repair them.
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Finally let's get to the electronics you are concerned about. Cars now have more control modules, (which are mini computers for systems, like the door controls) then in the past. There's door modules[2], ambient lighting module, cruise control, etc. The point is you don't repair these modules you just replace them. You aren't soldering little resistors onto a board or something. It's no different than replacing a steering wheel. It's just a thing. [5]
Many of these modules are for optional luxury items. If 20 years from now the ambient lighting and module doesn't work in my car who cares. If lane assist, blind spot detection, or the rear camera breaks then the car is just like the older cars you think are better.
I'm sorry to make this accusation but you are probably letting nostalgia, the current climate of simmering anger at the world, and the desire for things you grew up with and are comfortable with to form your opinions.
I want to put a millennial into a muscle car from the 60s and they'll see the over boosted power steering, the giant v8 that was overrated in power and get 10mpg, a body that leans in every corner, tires that can't grip, and a chassis that feels like a rubber band when you turn. A modern 4 cylinder turbo hot hatch would destroy them and outlast them.
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[1] Some older cars had timing belts and non-interference engines. This means that if the belt broke the piston wouldn't contact the valves and the only repair you'd have to pay for is the timing belt and towing. Still annoying but better. Timing chains make more noise and because of their weight create more drag on the engine but with engine covers and the power today it doesn't matter
[2] In the past cars didn't have as many modules even for things like like power locks. Power locks used to just have control wires and power running directly to other parts of the car where relays might turn them on and off.
The advantage of having a module is computer control. For example the following features are present on many new cars:
- lock the car when you start driving
- unlock in park
- windows up when rain is detected
- auto down and up windows (all the way).
- car can't go into drive when the door is open
- specific door warnings (though old cars had a general one)
Doing all this by running wires around to other devices is insane so there's a module the window switches, lock switches, door sensor, door locks, window motor, and etc all connect to which then receives control info from other modules
[3] A few performance cars and maybe some older models of mass produced cars still use hydraulic steering.
[4] Mostly due to "perceptions" of American quality, small cars becoming popular, and the horrific engines in American cars in the late 70s and 80s as American manf had little experience with small engines that people wanted because of the gas crisis. There's also an emissions issue. American quality has somewhat equalized after the late 90s IMO
[5] Modules do need to be programmed with the config for your particular car. Buying one for your model and in your country usually means it's fine. There are also programmers that aren't expensive and dealers will often do it for a fee.
[6] My experience with American cars was everything breaking besides the engine, then that going.
- Headliner would fall off and rub on your head
- The door that controlled recirculation of air would break because it's a cable connected to the knob on the hvac controls
- Plastic trim pieces came off or rattled
- Door locks would stop working or require two key turns or if I had a fob two button presses
- Rough idle and erratic idle
- AC definitely didn't work past 60k, probably R12 leaks
Rather have a cool new electronic feature break today than no AC
[8] Most popular style drive config is to have the engine in the front and front wheel drive. The diff is built into the transmission in this situation (called a transaxle) If your car is AWD or RWD with the engine in the rear you need to replace the differential fluid every so often. Larger SUVs are AWD, some sedans, many pickup trucks.
There are a few performance FWD cars that have a limited slip differential that requires a fluid change, super rare though (Elantra N, Golf GTI maybe R, Veloster?)
[9] Vacuum lines were how cool features pre 2000s worked in cars, like cruise control. Problem is the lines got cracked and a slow vacuum loss was difficult to diagnose and often caused unusual issues. I've been in so many older cars where cruise control just wasn't working.