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      07-25-2014, 02:37 PM   #1
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Technical Question: Cold Start

In the old days you had to start your car, let it idle for a few minutes and then you could go. This was a sure way to keep your car running for many years and just generally good practice, but I think there was also a mechanical reason for it.

In recent years this "requirement" has gone away with modern technology and changes to car design.

What about for my M4? Should I let it run for a bit before I leave for work in the morning or should I start it and go?
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      07-25-2014, 05:44 PM   #2
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Quote:
Originally Posted by sspyrops View Post
In the old days you had to start your car, let it idle for a few minutes and then you could go. This was a sure way to keep your car running for many years and just generally good practice, but I think there was also a mechanical reason for it.

In recent years this "requirement" has gone away with modern technology and changes to car design.

What about for my M4? Should I let it run for a bit before I leave for work in the morning or should I start it and go?
Start and go as the manual says. Just keep the revs down till it warms up.
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      07-25-2014, 08:08 PM   #3
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It's bad to cold start and let it idle. Just start driving as mentioned in the prvious post.
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      07-26-2014, 05:06 PM   #4
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Quote:
Originally Posted by sspyrops View Post
In the old days you had to start your car, let it idle for a few minutes and then you could go. This was a sure way to keep your car running for many years and just generally good practice, but I think there was also a mechanical reason for it.

In recent years this "requirement" has gone away with modern technology and changes to car design.

What about for my M4? Should I let it run for a bit before I leave for work in the morning or should I start it and go?
You live in Texas! When is it COLD?
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You're still a little new here, so I'll let you in on a little secret. Whenever Lups types gibberish, this is an opportunity for you to imagine it to be whatever you'd like it to be.
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How would you know this? Did mommy catch you jerking off to some Big Foot porn ?
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      07-26-2014, 05:10 PM   #5
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You live in Texas! When is it COLD?
Normally you'd have a solid point , but actually we can get a few moths of F 30.s to 40's especially as we did over last winter-spring. Even had a few days in the upper 20's - Austin with that little added elevation even more so. But bonus is pretty much all year driving conditions great (especially for my bike!) except when the odd hurricane comes to visit!!
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      07-26-2014, 07:32 PM   #6
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Normally you'd have a solid point , but actually we can get a few moths of F 30.s to 40's especially as we did over last winter-spring. Even had a few days in the upper 20's - Austin with that little added elevation even more so. But bonus is pretty much all year driving conditions great (especially for my bike!) except when the odd hurricane comes to visit!!
You made my comment look like what it was, an ignorant remark. Now that I actually have some understanding of Fahrenheit system, your word made sure I'll shut up next time.

When I think of Texas, I think of sweaty cowboys burying their latest victims from a gun fight/accident. Now I'll make sure they have at least once in a while coats with them!

I'm without coffee, as can be read from this. Situation will be handled in the next few minutes.
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You're still a little new here, so I'll let you in on a little secret. Whenever Lups types gibberish, this is an opportunity for you to imagine it to be whatever you'd like it to be.
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How would you know this? Did mommy catch you jerking off to some Big Foot porn ?
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      07-26-2014, 07:48 PM   #7
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Originally Posted by Lups View Post
You made my comment look like what it was, an ignorant remark. Now that I actually have some understanding of Fahrenheit system, your word made sure I'll shut up next time.

When I think of Texas, I think of sweaty cowboys burying their latest victims from a gun fight/accident. Now I'll make sure they have at least once in a while coats with them!

I'm without coffee, as can be read from this. Situation will be handled in the next few minutes.
- I'm worthless without my daily transfusion
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      07-26-2014, 10:43 PM   #8
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- I'm worthless without my daily transfusion
I know two people who don't drink any ever. I'm just waiting for them to start a career as mass murderers or something, that's just too freaky!
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You're still a little new here, so I'll let you in on a little secret. Whenever Lups types gibberish, this is an opportunity for you to imagine it to be whatever you'd like it to be.
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How would you know this? Did mommy catch you jerking off to some Big Foot porn ?
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      07-26-2014, 11:17 PM   #9
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Originally Posted by ciaranob View Post
Normally you'd have a solid point , but actually we can get a few moths of F 30.s to 40's especially as we did over last winter-spring. Even had a few days in the upper 20's - Austin with that little added elevation even more so. But bonus is pretty much all year driving conditions great (especially for my bike!) except when the odd hurricane comes to visit!!
Classic Texan, calling 30s to 40s cold! lol.
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      07-27-2014, 11:21 AM   #10
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Classic Texan, calling 30s to 40s cold! lol.
Well, born and bred in Ireland (dual citizenship) and have worked in -55F in northern Canada but yeah I'll stick to calling that cold - all relative my friend . Do get a laugh though from us 'northerners' when beating our chests about degrees of cold and yet we live in Houston
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      07-27-2014, 11:24 AM   #11
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I know two people who don't drink any ever. I'm just waiting for them to start a career as mass murderers or something, that's just too freaky!
But is there such a thing as too much as I may be a basket case . Ok, stupid questions - no and yes!
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      07-27-2014, 11:36 AM   #12
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But is there such a thing as too much as I may be a basket case . Ok, stupid questions - no and yes!
Haha, you drive bimmers and drink coffee, you're fine. But I know this amg dude, who does not drink any, and I would not turn my back on him! Too much wrong.

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You're still a little new here, so I'll let you in on a little secret. Whenever Lups types gibberish, this is an opportunity for you to imagine it to be whatever you'd like it to be.
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How would you know this? Did mommy catch you jerking off to some Big Foot porn ?
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      07-27-2014, 01:00 PM   #13
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Originally Posted by ciaranob View Post
Well, born and bred in Ireland (dual citizenship) and have worked in -55F in northern Canada but yeah I'll stick to calling that cold - all relative my friend . Do get a laugh though from us 'northerners' when beating our chests about degrees of cold and yet we live in Houston
I'm a northerner in Houston too. I like to tell people it gets pretty hot in Canada too. You know, 80s, sometimes 90. Lol
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      08-04-2014, 07:44 AM   #14
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Warm-up

The conventional wisdom is that, at idle, especially when the engine is cold ambient, idling briefly (5-10 seconds) and then a slow drive off is recommended. Placing the engine under light load increases oil pressure and oil circulation and warms the engine more quickly. Idling for too long, especially if you have an automatic start, is particularly bad. The low oil pressure and minimal oil circulation at idle isn't helping matters of longevity. Hence why taxi cabs are considered "severe service."

-Brian S.
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      08-04-2014, 08:13 AM   #15
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The only thing you don't want to do is start it and immediately take off at full throttle and high boost. The oils needs to get somehwat warm to flow nice and free through the turbos.
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      08-04-2014, 09:21 AM   #16
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Quote:
Originally Posted by gsrbri
The conventional wisdom is that, at idle, especially when the engine is cold ambient, idling briefly (5-10 seconds) and then a slow drive off is recommended. Placing the engine under light load increases oil pressure and oil circulation and warms the engine more quickly. Idling for too long, especially if you have an automatic start, is particularly bad. The low oil pressure and minimal oil circulation at idle isn't helping matters of longevity. Hence why taxi cabs are considered "severe service."

-Brian S.
What do you mean by "especially with an automatic start"?
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