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Originally Posted by dkveuro
There's some talk on other boards about the benefits of block heaters.......the people who are trying to squeeze the most milage out of their vehicles are paranoid about 'plugging in' every chance they get.
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As a professional mechanic, I'm sure you realize that a block heater
costs you money.
It's there for the convenience of the owner. Sure, it helps a diesel start easier when it gets quite cold. However, the cost of purchasing and installing the block heater, and operating it, can never be recovered by saving fuel due to starting a "warm" engine.
As posted above, operating a block heater overnight (even the typical 400W heater) is very costly to do.