What should engine oil temp run? - Ford Powerstroke Diesel Forum
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post #1 of 40 Old 10-17-2010, 06:51 PM Thread Starter
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What should engine oil temp run?

Was wondering what the engine oil temp should be? Was reading an article in a mag about the 6.0's installing an aftermarket oil cooler and was curious if it would be reccommended on a 7.3? Never seen any posts on oil coolers. Also, do ya'll run the same weight synthetic oil as you do dino oil? Thanks.
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post #2 of 40 Old 10-18-2010, 03:05 PM
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I checked mine with an inferred heat gun and mine read 196.
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post #3 of 40 Old 10-18-2010, 10:59 PM
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Between 190 and 210... Isspro EOT gauge.

You won't need any aftermarket oil coolers on a 7.3
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post #4 of 40 Old 10-19-2010, 02:00 PM
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I run about 215 when its 100 out. When pulling my 12k 5er and its 100 out I see 215 and sometimes 225 if its working really hard up a hill.

Numbers are from my edge evo2.
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post #5 of 40 Old 10-19-2010, 08:13 PM
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Quote:
Originally Posted by layson View Post
Between 190 and 210... Isspro EOT gauge.

You won't need any aftermarket oil coolers on a 7.3
What he said ^^^^

And since we're on the subject, the PCM advances timing below 180*.

The PCM advances timing ALOT below 160*.

So warm oil is a good thing.
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post #6 of 40 Old 10-26-2010, 06:22 PM
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I guess I'm not understanding your post ^^ ? What does advancing the timing have to do with oil temp?
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post #7 of 40 Old 10-26-2010, 06:49 PM
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Cold oil moves slow right?
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post #8 of 40 Old 10-27-2010, 05:14 AM
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Well this is true; hot oil moves at the rate it's supposed to move at; TOO hot though and it starts breaking down and not doing its job well. But what does timing have to do with this?
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post #9 of 40 Old 10-27-2010, 05:25 PM
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Engine Oil Temp is one of the variables that the PCM looks at to determine timing.

These aren't mechanically timed engines, timing fluctuates slightly depending on like 5 different tables.

But, in relation to EOT, the colder the oil, the more timing the PCM adds. Because the cold oil moves slow.

So, in order to to maintain Start of Ignition (call it SOIg) at an appropriate time, the Start of Injection (call it SOI) timing has to increase. Add a chip that is increasing timing to the equation and you're out of the "safe" zone.

So, let your oil get up to temp. Don't worry about it running at 200*. Some gassers run 250* remember. That's a bit to high for our oil operated injectors, just a comparison.

If you install an oil cooler, the truck may never crest the 180* mark where the EOT values level out and the truck runs approximately 26* of timing, at 3000 RPM's, with 3000 ICP, etc...

The further below 180* you get, the more SOI is increased to maintain SOIg. It makes a much bigger jump below 160*. Like, I try when ever possible to let my truck run at idle until it reaches 160*, then drive it easy until it crests 180* EOT.
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post #10 of 40 Old 10-27-2010, 05:35 PM
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I appreciate some brains on the situation. I had no idea of all this. I had no idea oil temp was pertinent to timing. But I thought advancing timing was good.. so why would the truck advance timing if the oil is cold?


On a side note.. the new 6.4's have oil coolers, trans coolers, ac coolers, ps coolers, fuel coolers etc.. why do the new 6.4's have oil coolers if they aren't a good thing?
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