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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Aug-01-2017, 02:46:49 PM   #51
WyattH
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Default Re: Getting Gas with the Engine Running

FWIW I've done >3 min warm ups for the last 30K, granted I don't live in an area that gets much below 50F, and my UOAs show zero wear or fuel dilution. Could be different with 5-20 minute idle warmups I've just read about.

I also wouldn't and don't ever leave my car running when I fill it up, and make a point of getting gas on my home when the engine is warm.
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Old Tue, Aug-01-2017, 02:52:31 PM   #52
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Default Re: Getting Gas with the Engine Running

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Originally Posted by WyattH View Post
I really don't pretend to know better, I'm just trying to learn why this is the case.
So where does the "3K" cold limit come from? My gauges say 5k or so is fine at startup, and the redline moves up from there as it warms. I sure as heck ain't going to 5k right after startup. And I have the conservative CSL warmup lights! Point is, y'all probably right but it's not just because BMW says it's so. We don't do 15K OCIs either.
It's not right because BMW says it's so, BMW (and many others) say it's so because it's right lol.

If BMW had warm up lights up to 2.5 or 3k people would freak out and complain about buying a car that can't be driven right away. Obviously it's really hard to quantify the damage to an engine from one cold start; likely going once to 5k after only a few mins of driving isn't going to have any noticeable effect on the engine or it's longevity. Most cars don't have any cold engine warning or lowered redline lights, but that doesn't mean you should rev the piss out of them when cold. BMW's OCIs aren't ideal but your engine isn't likely going to blow up prematurely from standard OCIs. It's not wise for them to pay to make sure everyone's engine is squeaky clean till 150k miles

It's up to you to do what you feel is best. BMW never told me explicitly to wash my car every week, but I still do it!
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Old Tue, Aug-01-2017, 02:55:00 PM   #53
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Default Re: Getting Gas with the Engine Running

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Originally Posted by WyattH View Post
FWIW I've done >3 min warm ups for the last 30K, granted I don't live in an area that gets much below 50F, and my UOAs show zero wear or fuel dilution. Could be different with 5-20 minute idle warmups I've just read about.

I also wouldn't and don't ever leave my car running when I fill it up, and make a point of getting gas on my home when the engine is warm.
I agree that I don't think a few mins of warm up is going to do much, but a cold start up in 50 degree weather is different than a cold startup in 0 degrees, then letting it sit for 15-20 mins to get warmish.
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Old Tue, Aug-01-2017, 02:59:03 PM   #54
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Default Re: Getting Gas with the Engine Running

With both the stock lights and CSL lights, I've seen it as low as 4k at start (which is every light on). Just need a cold PA morning
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Old Tue, Aug-01-2017, 03:16:59 PM   #55
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Default Re: Getting Gas with the Engine Running

Good point^ I once started up the M3 in -10 degree weather with 10w-60 in it. That was not such a fun experience

Needless to say, the warmup lights were maxed out
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Old Tue, Aug-01-2017, 04:52:04 PM   #56
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Default Re: Getting Gas with the Engine Running

On the same idea, i have cold started the car and had 7k rpm available right away. So per BMW Im ok to essentially redline it on a cold engine.

Hence why I dont care to much what the manufacturer tells you to do in the manual and more concerned with knowing the specific reason as to why that conclusion was met.

We disregard it on some(manufacturer rec.) occasions kand then use it as gospel in others. Idk
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Old Tue, Aug-01-2017, 04:57:30 PM   #57
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Default Re: Getting Gas with the Engine Running

The CSL warmup light values seem far more reasonable to me.

Maybe because the M3 was originally specced with 5w-30 (so the lights are calibrated for that) while the CSL was originally specced with 10w-60?
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Old Tue, Aug-01-2017, 04:58:26 PM   #58
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Default Re: Getting Gas with the Engine Running

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True. That's true. One could argue that BMW is fine with 5k rpms from the moment of "Starting up and driving away", and there seems to be zero indication that we should do otherwise.

And yet: clearly that's not a good idea.
Maybe it is okay????.....
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Old Tue, Aug-01-2017, 05:02:37 PM   #59
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Default Re: Getting Gas with the Engine Running

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Originally Posted by Obioban View Post
The CSL warmup light values seem far more reasonable to me.

Maybe because the M3 was originally specced with 5w-30 (so the lights are calibrated for that) while the CSL was originally specced with 10w-60?
Love the perpetual folklore surrounding this car. In 2000 years we will have stories of the mighty s54, how it ran on straight Bacardi and used special oil only found at Jesus' burial grounds.
Not a jab at you Obi btw. That might actually be the reason haha. Bmw just left way too many questions on the table with this one.
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Old Tue, Aug-01-2017, 05:41:49 PM   #60
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Default Re: Getting Gas with the Engine Running

Quote:
Originally Posted by Obioban View Post
The CSL warmup light values seem far more reasonable to me.

Maybe because the M3 was originally specced with 5w-30 (so the lights are calibrated for that) while the CSL was originally specced with 10w-60?
good call, could be that.
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Discussing Getting Gas with the Engine Running in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)