First off. My last parent, my dad, is going in soon for surgery to have a tumor removed from his spine. Btw soon in Manitoba medical is NOT a good thing. It means they think it is serious.. He was told he has a 10% chance to walk again after surgery. For a man that hasn't sat still for very long unless sleeping this is not good news.
I refuse to cry.
Second there is many "experts" out there saying that you should only let your car warm up 30secs then drive it.
Okay that i think is downright fraud. Even an electric car needs some time to warm up or things wear out badly. In the case of a gas or diesel engine this is much more important.
Most cars have aluminum(or aluminum titanium alloy) pistons. These pistons when cold are NOT round but oval. It takes them a good 5 minutes to not be oval at temperatures below 0 c. Driving with oval pistons creates a lot of wear on cylinder walls and increases engine blow by significantly. Btw engine blow by makes more pollutants that regular exhaust.
PCV valves and ERG valves only work at IDLE. Not during regular running.
In electric motors that have much closer tolerances running cold causes very interesting things on electric windings.
Transmissions: New or old none of these like to run cold. Gears fatigue, seals bust, valvebodys dont shift, solenoids freeze up. shafts for belt drives get advanced wear... the list is endless. Running in neutral while engine warms up allows these to warm up as many cycle fluids in neutral without a load.
Btw to give you a better idea what actually happens during a cold run on engine. As soon as you put car into gear on a cold engine that piston slaps against one side of the cylinder.. over time, and I have seen this more than a few , the piston rod bends so that the piston is runnning on that side of cylinder.
The other side of cylinder can have cross patterns. When an engine is new or rebuilt the sides of a cylinder recieve a cross honed pattern. This allows the piston rings to seat(wear to match cylinder creating a better compression and therefore fuel burn)
New fuels, fuel systems, and or engine oil doesnt make a bit of difference on any of this.
Anyways just my rant on the "experts'" subject.
As a note my personal car that I have driven 17 years is as good as it is now as when I got it engine wise. I change oil regularly, I plug it in when not in use during winter, and I always let it warm up. Niether the engine or transmission have been rebuilt. And they dont need to be either. How many of you, who do not let your cars warm up, are driving the same car that you had for 17 years and have a good running engine and transmission?