+1 on the block heater. Everything else compared seems like a HUGE effort for a similar gain. though, radiators are fairly cheap and simple to acquire and plumb, from parts lots.
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"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
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