What is considered as 'Optimal' engine oil temperature... ?

217 degrees is about the sweet spot. Hot enough to burn off any crud. Love that you have that information available, I think I would probably need a Hondata for that.
It’s nice especially when towing in extreme conditions. Last summer I had to tow our 8k pound camper through the mountains. It was over 100 degrees and it was the first time I’d towed it that far. So I was already nervous. Keeping an eye on things made me feel a little better 😂
 
Would these temps be for a racing engine in this image?

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My 6.4 Diesel runs 238* Pulling heavy.
My 6.7 ran empty 210* and 240* with the stock oil pan. It now runs 196* empty and 228* loaded heavy. They (The haters..lol) said the pan wouldn't make a hill of a difference. Absolutely 100% False. It does in fact keep temps a few degrees cooler,however, it is much slower to warm the oil and the pan blocks the trans cooler so it's 5* warmer than before.

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The F550 service truck I used to drive ran 208F on flat and 235F on hills. I sure didn't like those temps but I ASSume ford knows more than me.
 
There's been a whole lot of 'my engine oil runs at' and 'my system of measurement can beat up your system of measurement' responses
on this thread but precious little technical information related to the OP's question.

@RDY4WAR and @930.engineering
gave some good answers and I would like to read more like that if at all possible. :)

The original poster's question was what is the optimal oil temperature.
That's not the same question as what is the average temp of some particular vehicle !

Acceptable and optimal are two different things.
The OP didn't ask what is acceptable, but rather what is optimal !

⬆️ (y) THANK YOU, for reading the thread creator's starter post properly (y) ⬆️
 
Have a 19 row cooler for the Z. Temps sit around 90c with regular and some what spirited driving. Stop and go garbage traffic causes 110c and then cools down when it’s back to normal driving conditions.
 
217 degrees is about the sweet spot. Hot enough to burn off any crud. Love that you have that information available, I think I would probably need a Hondata for that.
Was thinking that too. Love the granularity of the data. All my truck gives me is a bar. Which means literally nothing except when the bar gets too hot it flashes. To see that, I had to hook up a scangauge and tinker with all sorts of different settings until I got what I think is the actual oil temp data.

Which by the way, never hits "optimal" on my Tacoma per consensus on this thread. I almost never see oil temps above 194F (72ºRé or 135°De for those who prefer not imperial units). I'll have to send off a UOA and see the consequences of that.
 
My "racecar" is the only one I have an oil temp gauge in and it runs cool. I can only attribute that to the fan for my a2w charge cooler is immediately in front of the motor and is always running.

During the summer I was seeing 160-170. Yesterday in 30⁰ weather it barely got to 130 driving to work.
 
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