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Originally Posted by EndyKwon So running an oil cooler would make the engine run less efficiently as far as MPG goes? Not really. The oil has very little to do

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Old 04-01-2013, 10:05 AM   #22 (permalink)
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Originally Posted by EndyKwon View Post
So running an oil cooler would make the engine run less efficiently as far as MPG goes?
Not really. The oil has very little to do with cylinder/gas temps and, as KERMIT points out, the effects of engine temperature on efficiency can be subtle.

It's not really something the average weekend mechanic wants to mess with as there are a lot of other variables involved. Changing the engine temp (eg, by installing higher/lower temp thermostat) can affect how the ECM reacts. Plus there are limits to how far you can go before pre-ignition becomes a problem - especially with a high-compression engine.
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