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We have a remote start in the 'ol Mazda, more for convience than saving the engine.
There is one very good purpose for thsese devices. When having to park in very cold environments where a electrical plug-in for your block heater is not available, then units that use a cold-temp sensor can start your vehicle below certain ambient temps, and runt he car/truck for a specificed time, shut it down, and wait.
This can mean the difference between start/no start in tough situations. Very common use for rig workers, pipeline workers, etc.
And yes, driving it warms the engine must faster.
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