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#4709436 - 03/28/18 10:34 AM Oil/coolant temps on morning commute
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1243
Loc: Oregon
I have a "Carly adapter" for my BMW which, among many other things, allows me to monitor engine parameters. I was curious what my oil and coolant temps do on an average morning commute.

Vehicle is a second gen BMW X5 with the 4.8L V8 (9 quart sump + 1-2 quarts in the oil cooler). Oil is Castrol 0W-40 with about 2k miles on it.

Ambient temp throughout the whole trip: 45 F

7:55am - Start car. Oil and coolant at 45 F. Let idle for 5 minutes while I go inside and grab breakfast and coffee (my standard routine).
8:00am - Oil is at 81 F and coolant is at 132 F. Start driving to work (mix of stop/go and low-speed cruising around 45mph)
8:09am - Coolant is finally up to temp (220 F). Oil is at 180 F
8:13am - Arrive at work. Oil is at 190 F

I'm actually surprised how fast the oil came up to temp (oil operating temp is 210 - 220... thermostatically controlled) given that its a 9 qt. sump. I'm sure the piston oil-squirters have something to do with it.

Does anyone else have a short commute and track oil/coolant temps? Cheers.
_________________________
2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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#4709450 - 03/28/18 10:44 AM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
2010Civic Offline


Registered: 12/06/14
Posts: 363
Loc: Minnesota
Coolant is 220F? Doesn't that seem hot?
_________________________
2010 Honda Civic LX
Valvoline SynPower 5w-20 - Honda oil filter
54,061 miles

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#4709459 - 03/28/18 10:52 AM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1243
Loc: Oregon
Every BMW I have seen runs around 220 F. The newer N63 engine (hot-V twin turbo) runs at 225 while cruising. All of these engines have electronic thermostats and/or water pumps and will drop temperature when getting on the throttle or climbing a hill.
_________________________
2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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#4709468 - 03/28/18 11:04 AM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
Patman Offline



Registered: 05/27/02
Posts: 20501
Loc: Oakville, Ontario
My commute to work is 12 miles and I did track my Corvette's oil and coolant temps the other morning when it was 26F outside. The car started out in my garage, so the oil and coolant were about 70F to start. After 4 miles of driving (with 3 of those being on the highway at 70-75mph) the coolant temperature got up to 192, the oil temperature was 181. Just one mile later the oil temperature caught up and hit 192. In order to help it warm up a bit quicker, I used the paddle shifters and held it in a lower gear than it normally would in drive. If I left it in drive it would keep the rpms closer to 1300-1500. But I chose the gears which would keep it closer to 2000 rpm. The next day, with the same outside temp, I tried keeping it in drive, and it took at least 2 miles longer before I reached these same coolant and oil temps.

I am happy at how quickly the oil gets up to temperature in this car, as this is pretty much the coldest temperature I will drive it to work in (because of the summer tires) I will test it again in warmer weather to see the difference.

FWIW, I can drive for a long time on the highway and my oil and coolant temp will stay at 192F the entire time.

My Corvette's engine holds 7 quarts of oil, the dry sump Corvettes hold 10 quarts and take a bit longer than mine to warm up based on what others have told me.
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2018 Corvette (M1 5w30 ESP Formula & Fram Ultra)
2006 Civic EX Coupe (PUP 5w20 & Fram Ultra)
2010 BMW 328i X-Drive (GC 0w40 & Mann)


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#4709483 - 03/28/18 11:20 AM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 4068
Loc: New England
My commute is 10 miles on surface streets or 12 miles if I take the highway for the second half.
I have oil temp up on my MFD, but it doesn't show anything below about 90F. I'd assume I could get coolant temps and the full range of oil temps on my phone using Torque, but I haven't tried it yet.
I rarely idle for any length of time unless it's quite cold or I decide to leave it on to melt after I move it while clearing the driveway after a big snowstorm, we are in a 2 car garage/3 car situation for now and it's easiest for me to park outside. It's not unusual for the oil temp to still be under 150F when I get to work during a cold snap, believe it was about 190F when I got to work today with the temps right around freezing. Normal operating oil temps on the highway in warmer weather are ~195-210F, highest I have seen was something like 232F on a hot day while driving through mountains with a high HTHS 5W30 (M1 5W30 ESP) in the sump.
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#4709730 - 03/28/18 03:02 PM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1911
Loc: SE British Columbia, Canada
This is all very interesting. The question is whether it's possible for the oil temperatures to get as high or much higher than the water temperature. The reason ask that is my water temp never gets varies from 210 F whether it's a hot day at 90 F or a cold day at -15 F. A lot of people think their oil temperature is sky high in the summer. I'm not so sure.

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#4709772 - 03/28/18 04:00 PM Re: Oil/coolant temps on morning commute [Re: Snagglefoot]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1243
Loc: Oregon
Originally Posted By: Snagglefoot
This is all very interesting. The question is whether it's possible for the oil temperatures to get as high or much higher than the water temperature. The reason ask that is my water temp never gets varies from 210 F whether it's a hot day at 90 F or a cold day at -15 F. A lot of people think their oil temperature is sky high in the summer. I'm not so sure.


I think it depends on a few things like sump capacity, does it have an oil cooler or piston oil squirters, proximity of pan to exhaust, etc. Id say most commuter cars have high oil temps in the summer due to them having no oil cooler and small sumps.
_________________________
2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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#4709848 - 03/28/18 05:20 PM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
Patman Offline



Registered: 05/27/02
Posts: 20501
Loc: Oakville, Ontario
What I have found with all of my Corvettes is that when you start driving them hard for long periods of time, the oil temperature will indeed climb higher than the coolant. For example, the coolant might run in the 200-210 range, but then the oil temp would be 220-230.

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#4709857 - 03/28/18 05:25 PM Re: Oil/coolant temps on morning commute [Re: Snagglefoot]
Shannow Offline


Registered: 12/12/02
Posts: 40205
Loc: 'Stralia
Originally Posted By: Snagglefoot
This is all very interesting. The question is whether it's possible for the oil temperatures to get as high or much higher than the water temperature. The reason ask that is my water temp never gets varies from 210 F whether it's a hot day at 90 F or a cold day at -15 F. A lot of people think their oil temperature is sky high in the summer. I'm not so sure.


Yep,
my L67 Caprice, I got the oil temperature to 135C (type K thermocouple down the dipstick hole) just by holding the gearbox in "2", and driving 10 minutes at 100km/h...in "D" on the same trip it was low-mid 90s.

Revs increase oil temperature, with load being a smaller player.

Road load was the same in either case, just the revs changed.

That's why your oil warms up quicker driving off gently (and holding it around 2-2,500RPM) than letting it idle.

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#4709868 - 03/28/18 05:32 PM Re: Oil/coolant temps on morning commute [Re: Shannow]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1243
Loc: Oregon
Originally Posted By: Shannow
Revs increase oil temperature, with load being a smaller player.

Road load was the same in either case, just the revs changed.

That's why your oil warms up quicker driving off gently (and holding it around 2-2,500RPM) than letting it idle.


I would assume this is due to friction being converted to heat in the main and rod bearings, and to a lesser extent the cam bearings.
_________________________
2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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#4709880 - 03/28/18 05:48 PM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
Shannow Offline


Registered: 12/12/02
Posts: 40205
Loc: 'Stralia
Yep, mains, rods, and piston skirts...

Here's a couple of charts (some would call nonsensical finger painting), but I think add to the discussion.

First two specifically warmup...

The frictional drag in bearing surfaces as an engine warms up.


The difference between speed and load in warming the oil.


And a couple that demonstrate my Caprice experience, and why racetracks heat oil.

Heat flows OUT OF bearing and into the block from bearings in a small engine at different engine speeds.


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#4709882 - 03/28/18 05:53 PM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1243
Loc: Oregon
Very cool. Thanks Shannow!
_________________________
2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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#4709915 - 03/28/18 06:34 PM Re: Oil/coolant temps on morning commute [Re: Snagglefoot]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: Snagglefoot
This is all very interesting. The question is whether it's possible for the oil temperatures to get as high or much higher than the water temperature. ....A lot of people think their oil temperature is sky high in the summer. I'm not so sure.


Alternatively....

My Cummins diesel oil temp is always higher than coolant temps (once up to operating temperature).

It has a HUGE liquid-to-liquid oil cooler built-in where the oil filter threads onto, and RIGHT WHERE the lower radiator hose enters the engine!
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4709928 - 03/28/18 06:41 PM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17929
Loc: PNW
Engines with coolant-to-oil type of heat exchanger will also warm up the oil much quicker than engines without that type of oil cooler.

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#4710080 - 03/28/18 09:38 PM Re: Oil/coolant temps on morning commute [Re: 1JZ_E46]
dave1251 Offline


Registered: 07/15/05
Posts: 8698
Loc: Maricopa, AZ
My commute is able 5 miles the oil is close to operating temp after 8 minutes at 40MPH. 7 quart capacity 5W30.
_________________________
make the inside of your engine oil cap white.
don't use.

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