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Old 03-24-2019, 08:20 AM   #19 (permalink)
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Originally Posted by Taylor95 View Post
I agree with a hotter thermostat being more efficient. Here is someone else's experience:

I have also read experiences where people have resolved their bad gas mileage by replacing their 165 degree thermostat with an OE 195 thermostat.
My 05 TJ has a 210* thermostat stock. I don't like running so close to boiling point. Remember this is an ancient engine. It's ridiculously fast to warm up considering there's 200+lbs of iron in it! Lots of excess heat.

All 'new' cars I've had run 190 degrees and in normal driving the thermostat doesn't actually open fully since their normal operating temp is 176 degrees. Its been this way on my last three Euros so it's not just coincidence. Fans kick on at 200 and it seems the only way for this to happen is with a really aggressive grill block.

Could also be that this is done for NOx control. Two of them have 20k mile oil change intervals so if lower temps reduce oil deg then it could be done for that reason too.

But it seems to me new cars run cool.

Last edited by oldtamiyaphile; 03-24-2019 at 08:26 AM..
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