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Old 03-05-2012, 09:31 PM
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Engine Oil temperature = tranny oil temperature?

Hello, I have the regular xlt version gauge without engine oil temperature and I was wondering if the gauge for the tranny's oil temperature was an indication for the engine's oil also. For example in the morning it takes around 10kms to see the tranny's gauge moving up, would it mean the same for the engine's oil. I know that they are not directly related but again they might have the same warming process. Maybe a silly question but I really miss an oil temperature gauge. Thank you!
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Old 03-05-2012, 09:36 PM
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No not related
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Old 03-06-2012, 01:50 AM
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Nope not at all. Engine oil temps rises nearly identicle to the coolant on warm ups while the tranny can stay cold for a long time. I've noticed on some really cold days here when I start it up My oil is lower than 5*F same with the coolant and on my slow 45 min drive through the city to worksites the coolant and oil will get up to 175*F and the tranny will stay around 110*F and sometimes not even move the gauge on the dash.
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Old 03-06-2012, 07:49 AM
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Thanks Matty21 for those details. Anyway it helps me as it means that when the tranny gauge moves toward the middle, engine's oil is already warm if I understand you correctly. Funny in my case tranny's oil will move much faster than 45mn but I almost don't do city drive and we almost don't have cold days here neither! Thanks again.

Last edited by Arhaifa; 03-06-2012 at 07:52 AM.
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Old 03-06-2012, 08:07 AM
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Engine oil will warm as fast or slightly faster than engine coolant. The Oil can go quite a bit higher. Coolant usually maxs out below 200 Oil temps have gone as high as 242 when I tow.

Can't say that I've ever noticed the tranny temps go as high as the oil temps. Once warmed up the tranny seems to stay about the same temps as the coolant.

The 6.7L engine sprays a jet of oil into a hole in the bottom of the piston. To help cool the pistons. The oil flows through the top of the piston and exits from a hole on the other side. There is an Engine Oil cooler located on the left side if the oilpan, where the engine coolant takes heat out of the engine oil.

The 6.7L has two cooling systems. The primary or High temp cools the engine. The secondary cooling system, a low temperature system which cools the Charge Air Cooler (CAC), Fuel Cooler, EGR cooler and Transmission oil cooler. So it is definitely possible to see different temps in the two systems since they do not inter connect.
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Old 03-06-2012, 10:11 AM
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So I understand that the 2 systems are disconnected and how they work. I am surprise when you say that engine oil will warm up as fast as engine coolant. Usually coolant has much less thermal inertia than oil and that's why on most engines coolant warms up much faster than oil. Is the 6.7 an exception?
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Old 03-06-2012, 12:17 PM
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As I watch mine the mornings, I see the two temps warm up very close to the same. 5-10 difference.

I have no idea which coolant system the Edge CTS is displaying.
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Old 03-06-2012, 12:49 PM
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Quote:
Originally Posted by Arhaifa View Post
So I understand that the 2 systems are disconnected and how they work. I am surprise when you say that engine oil will warm up as fast as engine coolant. Usually coolant has much less thermal inertia than oil and that's why on most engines coolant warms up much faster than oil. Is the 6.7 an exception?
You are correct, the coolant will warm up and cool down faster than the oil.
Quote:
Originally Posted by Painted Horse View Post
As I watch mine the mornings, I see the two temps warm up very close to the same. 5-10 difference.

I have no idea which coolant system the Edge CTS is displaying.
Same here.
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