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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