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      08-17-2018, 07:39 PM   #1
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Engine warm up

Coming from a 2011 535, it used to take like 10-15 minutes for my engine to reach operating temp, in the new 2018 440 it seems to get up to temp in under 5 minutes.

Is this normal, and can I push the car this early from a cold start?
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      08-17-2018, 07:54 PM   #2
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I have the same observation in comparison to my 2011 Audi TFSI.
The BMW gets up to temperature noticeably faster.
Whether you can push it already then - I follow the principle "don't if you don't necessarily have to"... Prefer waiting a bit longer.
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      08-17-2018, 08:11 PM   #3
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I let the temp gauge needle move off cold to let the oil warm up. You can beat on it after start up but why are you in that much of a hurry? Warmer oil flows better and keeps everything from wearing under high stress. I laugh at all these videos that show cold starts and you hear them gunning them to get the pops/burbles on video with condensation still coming out of the pipes......
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      08-17-2018, 08:19 PM   #4
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Not really in a hurry, always let the car idle for a minute on cold start. Just I use my oil temp gauge as an indicator that it's ok to go into sport mode, don't like the idea of doing it so early.

I also drive light footed for the last couple min of the drive to kinda let everything cool off.
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      08-23-2018, 11:45 AM   #5
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Quote:
Originally Posted by CalCarNut View Post
I let the temp gauge needle move off cold to let the oil warm up. You can beat on it after start up but why are you in that much of a hurry? Warmer oil flows better and keeps everything from wearing under high stress. I laugh at all these videos that show cold starts and you hear them gunning them to get the pops/burbles on video with condensation still coming out of the pipes......
More than the oil getting up to temp, the different metals in your engine expand at different rates. Oil temp is a good indicator but I typically wait 15 minutes or so before driving too hard.

Was the the e46 m3 that had lights on the tachometer that slowly increased "redline" as the engine warmed up?
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      08-23-2018, 12:01 PM   #6
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On a stone cold motor, 70-90 degree ambient air temps, and per my Torque app, it take approximately 10 minutes of steady driving for the oil to get up to 180 degrees which is the bare minimum temp for hard driving/heavy boost. If it's colder out, especially below 50 degrees, add 5 more minutes. If it's 20 degrees, the oil has trouble getting up to and maintaining 180 degrees.
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      08-23-2018, 12:05 PM   #7
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Quote:
Originally Posted by NavS View Post
Not really in a hurry, always let the car idle for a minute on cold start. Just I use my oil temp gauge as an indicator that it's ok to go into sport mode, don't like the idea of doing it so early.

I also drive light footed for the last couple min of the drive to kinda let everything cool off.
I think those are good practices, especially letting it cool off after a drive (before shutting off the engine). Probably unnecessary in today's age. But it's a simple precaution.

Personally I drive for about 10 minutes before getting on the gas. The engine oil gets up to temp fast as you've observed, but there are other fluids to consider - differential, transmission, etc. Not sure if they warm up as fast.

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      08-23-2018, 12:20 PM   #8
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Quote:
Originally Posted by NavS View Post
Coming from a 2011 535, it used to take like 10-15 minutes for my engine to reach operating temp, in the new 2018 440 it seems to get up to temp in under 5 minutes.

Is this normal, and can I push the car this early from a cold start?
b58 gets warm quickly..
the coolant circuit is bypassed on coldstart
then shortly aided by a heater
then later coolant kicks in
so it gets warm quicker
but I would still wait for operating oil temps b4 getting on boost
turbos r delicate creatures

b58 also continues cooling the turbo after you shutoff so no need for the ancient practice
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      08-23-2018, 01:25 PM   #9
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Get in, start the car & drive off. Don't push it till the oil temperature gauge needle starts to move up before running hard. If you have a water temperature gauge instead of an oil temperature one wait till its at normal operating temperature.

Takes longer for the oil to warm up & oil is the key. I have both gauges in some cars & its a pretty big spread between water & oil coming up to operating temperature. You can have heat in the car with cold oil.
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      08-23-2018, 02:01 PM   #10
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I always waited until my car's cold start RPMs went down to the normal idle RPMs, however i don't throttle my car and hit over 3k RPMs until the engine has warmed up fully. My brother got a brand new car and he always jumps into his car and puts it into the drive and heads to work. He also throttles it when getting on the highway. Long story short i have noticed his car is idling very hard now, and it sounds terrible when it first is started on a cold start. Just to shows a couple minutes of waiting until it warms up will prevent problems later on, and im sure his car now is showing signs of what he does to it, the poor car... Luckily its a toyota and not a BMW!
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      08-23-2018, 06:58 PM   #11
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Quote:
Originally Posted by Breezin View Post
I always waited until my car's cold start RPMs went down to the normal idle RPMs, however i don't throttle my car and hit over 3k RPMs until the engine has warmed up fully. My brother got a brand new car and he always jumps into his car and puts it into the drive and heads to work. He also throttles it when getting on the highway. Long story short i have noticed his car is idling very hard now, and it sounds terrible when it first is started on a cold start. Just to shows a couple minutes of waiting until it warms up will prevent problems later on, and im sure his car now is showing signs of what he does to it, the poor car... Luckily its a toyota and not a BMW!
Yes this practice is advisable if you have the luxury to do so and want longterm reliability
to start driving right off the bat is maximizing the time the engine is running with any load lubricated with sub-operating temperature oil
much of the engine wear occurs in this critical period
esp in cooler temps & with the B58 which reaches fairly high levels of torque at such low RPMs
not good for bearings
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      08-23-2018, 07:50 PM   #12
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Quote:
Originally Posted by Breezin View Post
I always waited until my car's cold start RPMs went down to the normal idle RPMs, however i don't throttle my car and hit over 3k RPMs until the engine has warmed up fully. My brother got a brand new car and he always jumps into his car and puts it into the drive and heads to work. He also throttles it when getting on the highway. Long story short i have noticed his car is idling very hard now, and it sounds terrible when it first is started on a cold start. Just to shows a couple minutes of waiting until it warms up will prevent problems later on, and im sure his car now is showing signs of what he does to it, the poor car... Luckily its a toyota and not a BMW!
I warm up my car the same exact way
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      08-24-2018, 12:09 PM   #13
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Interesting this same discussion is blossoming in another thread. Users are saying their N55 takes 15 min or so to heat up but my '18 B58 heats up in 5 min or so. On warmer days it's in the middle of the gauge before I get on the highway (less than 2 miles from home). But I'm pretty convinced that, at least mine with the 6WB cluster, is a dummy gauge to some degree. I have never seen it move from the middle when I know the temps fluctuate based on normal driving conditions, and on top of that it sounds like BMW does some magic with how the cars allows temps to increase and decrease based on how you're driving.

More discussion:
https://f30.bimmerpost.com/forums/sh...php?p=23634882
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      08-24-2018, 12:24 PM   #14
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I would wager that most cars have their cold engines rev'd way past 4k (even redline) within the first 5-10 minutes, especially lower HP/TQ vehicles. Most people are clueless in this regard and many don't even give a damn because their cars are leases and will simply pass potential or impending problems down to the new owner(s).
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      08-24-2018, 12:27 PM   #15
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Quote:
Originally Posted by kern417 View Post
Interesting this same discussion is blossoming in another thread. Users are saying their N55 takes 15 min or so to heat up but my '18 B58 heats up in 5 min or so. On warmer days it's in the middle of the gauge before I get on the highway (less than 2 miles from home). But I'm pretty convinced that, at least mine with the 6WB cluster, is a dummy gauge to some degree. I have never seen it move from the middle when I know the temps fluctuate based on normal driving conditions, and on top of that it sounds like BMW does some magic with how the cars allows temps to increase and decrease based on how you're driving.

More discussion:
https://f30.bimmerpost.com/forums/sh...php?p=23634882
Will positively guarantee you can't get 7 quarts of oil up to temperature in 2 miles even in Saudi Arabia.

The water does come up to temperature quicker for the heater then the N54/55 because the closed deck block has a “heat management module” on the B58, which is mechanically powered directly by the crankshaft through a serpentine belt. Inside the module, coolant flow rate is adjusted by a rotary valve
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Last edited by BEAR-AvHistory; 08-24-2018 at 12:36 PM.
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      08-24-2018, 12:30 PM   #16
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Yes, the correct way to quickly warm up a motor is to drive within the first 30 seconds of a cold start and drive moderately until the oil is fully warm. As others noted, oil takes a MUCH longer time to warm up than coolant. I watch it all the time on my Torque app. During warm up, oil lags behind coolant by about 5 minutes in terms of getting up to a safe operating temp.

The N55 DME is pretty smart though as the wastegate will bleed boost until oil is warmed fully. Even so, unless it's an emergency situation, let your oil fully warm up and disregard what the coolant gauge is telling you as it's basically a dummy gauge that tells you three things: cold engine, operating, and overheating
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      08-24-2018, 03:38 PM   #17
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Quote:
Originally Posted by BEAR-AvHistory View Post
Will positively guarantee you can't get 7 quarts of oil up to temperature in 2 miles even in Saudi Arabia.
This is what I question, living with an N55, can't see how other N55 engines or the B58 can be much faster heating up. If anything, as petrol engines become more efficient, heat up will be slower, as there is less waste heat. We start approaching diesel warm up times, which we know are even slower, due to better thermal efficiency,

Being a diesel owner, I'm used to oil taking as much as twice the time to heat as coolant, particularly slow in winter months where even after 16 miles, oil is not up to temperature. When I took on the 535i, I was expecting much faster ECT heat up than a 3-litre diesel, with oil temperature still lagging well behind the ECT.

Was surprised that ECT is still quite slow to warm, oil is just a few degrees behind, and virtually levels out as the N55 engine's ECT reaches close to optimum running temperature.

Looking at the design I put the faster oil heating, (at least partly) down to how the oil sprays the underside of the piston crown, acting as a heater to the oil in the warm up phase. That in turn slows the ECT rise, as more of the available waste heat goes to the oil directly.

BMW haven't given as much detail on the B58 oil circuit as the N55, but imagine it will be similar for heat control.

If users are really getting to full temperature in so few miles/minutes, (my 5-series takes at least 12 miles/15 - 20 minutes, when the ambient temperature is below 10C/50F to get to optimum running temperatures), what's the mechanism for doing so, other than using more fuel?
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      08-24-2018, 03:43 PM   #18
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The B58 engine has a water/coolant jacket around it to help hold in temperature for up to 36 hours for less wear and tear on the engine.

This is why your car warms up faster.
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      08-24-2018, 04:18 PM   #19
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Quote:
Originally Posted by Blubaron79 View Post
The B58 engine has a water/coolant jacket around it to help hold in temperature for up to 36 hours for less wear and tear on the engine.

This is why your car warms up faster.
So does the N55.
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      08-24-2018, 04:20 PM   #20
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Quote:
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Quote:
Originally Posted by Blubaron79 View Post
The B58 engine has a water/coolant jacket around it to help hold in temperature for up to 36 hours for less wear and tear on the engine.

This is why your car warms up faster.
So does the N55.
Not like the B58. It was meant to keep the temperature over 3 times longer than the N55. Look up all the tech specs on the B58. It's all there.
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      08-24-2018, 04:27 PM   #21
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Quote:
Originally Posted by Blubaron79 View Post
The B58 engine has a water/coolant jacket around it to help hold in temperature for up to 36 hours for less wear and tear on the engine.

This is why your car warms up faster.
Thanks for the input. Have missed that for the 3/4-series models.

I must look into this a bit more, thought that only came with the latest installations, like the latest 5 & 7 series.
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      08-25-2018, 03:59 AM   #22
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My b58 takes at least 10 mins on freeway to hit normal temp
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