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That's not true, cold starts cause wear not warm starts.
At most it's starter motor and battery wear, start stop cars have agm batteries for that reason.
What about the fact that the oil drains to the pan in those few seconds that the engine is stopped?
This is my real concern. Sure you can upgrade starter motors and batteries to handle the extra cycles, but you can’t do anything about increased scoring and wear on cylinders in the milliseconds before the fluids start to circulate again.
Some start stop engines have auxiliary oil pumps. I don't know much about them besides random research I have done in the past out of curiosity.
Napa also claims some vehicles have auxiliary water and transmission pumps as well.
That might be true, I’m not a mechanical engineer but despite that, my understanding is that within the engine block itself, cylinders are primarily lubricated via the system holding pressure. This pressure starts to drop the second the engine ceases.
You can notice the effect on cars that have realtime oil temp monitors. Mine does, and it’s digital. My stable oil temp is around 216 degrees Fahrenheit. After a start-stop cycle, even for only 5-10 seconds or so, the temp drops about 5-8 degrees. After a minute, the temp is down 25 degrees. That’s significant. Essentially the engine is no longer “at temp” for the first 30 seconds or so after it resumes. That’s 30 seconds of additional semi-cold, under pressure wear each cycle.
Then why do so many new car models have auto-stop features that kick in at red lights? They would not do that if it wasn't more efficient.