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Originally Posted by Ecky
@Xist, there are hot points in the engine that are already well above 200f. Cylinder walls? Around the valves in the head?
Notice mixing of units. 300f != 300c. 300c is almost 600f.
I imagine 250-300f shouldn't be too much of a problem if you're running a decent oil that doesn't start to burn until 450+.
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I was just sharing comments, but I will update that post. Unfortunately, comments are closed for Business Insider. I just wanted to show that it could not return the investment in less than a month. Someone on Popular Mechanics did the math for his Accord and came up with similar numbers to mine.
Other comments from PM:
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Perhaps better to heat the air intake
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if something can't pay for itself, it's not using fewer resources which means it's not "saving the planet."
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Someone commented that oil coolers are for the transmission.
Neighborhoods in Arizona usually have apartment-style mailboxes, where each block will have one or two clusters. It seems like absolutely everyone leaves their engine running and door open while they get their mail and they live an average of a quarter-block from the mailbox.