Answer to this question is not easy. On the one hand, with cold engine operation (especially with high load) actually accelerated wear, and not only because of lack of lubrication, but also on the temporary mismatch gap between those that are required. Indeed, only after the engine warms up, it reaches the set designer temperature at which the dilated parts interact correctly.
On the other hand, because of the idling engine works with a small heat transfer and heat slowly, so that when it is fully charged, - means to extend its running time in the worst mode.
However, the slow engine warming in its details do not appear dangerous thermal stresses, and at very fast heating, they are not excluded. It is known that for any changes in temperature of engine parts, in many cases there is any damage. Warping of the cylinder head or piston seizure is often explained by this.
As for foreign cars, their manufacturers do guided environmental requirements. It is believed that damage to the environment is unacceptable. Even if the trip on a cold engine is bad for his part, has to put up with this.
When it comes to domestic cars, correctly, perhaps, follow the factory instructions. Usually recommended to embark on a journey to reach the engine temperature at which it works stably without the "choke." It is approximately 40 - 50 ° C.
On cars with fuel injection temperature at which you can go on the road, may be lower.
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