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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 Fri, Jan-12-2018, 08:10:08 PM   #31
Obioban
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Default Re: Mitigating Cold Start Wear

I reprogrammed my cars with CSL warm-up light values, and they're pretty reasonable-- I actually follow them.
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Old Fri, Jan-12-2018, 08:11:11 PM   #32
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Default Re: Mitigating Cold Start Wear

Wait, so quick question. (dont mean to thread jack)

I read in a few posts that it wasn't ideal to idle the car until "warm." Is this true? I have been turning on my car and leaving it run for 10 min or so in the mornings before I drive it.

Is that bad??
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Old Fri, Jan-12-2018, 08:13:07 PM   #33
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Default Re: Mitigating Cold Start Wear

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Originally Posted by gam3cock View Post
Wait, so quick question. (dont mean to thread jack)

I read in a few posts that it wasn't ideal to idle the car until "warm." Is this true? I have been turning on my car and leaving it run for 10 min or so in the mornings before I drive it.

Is that bad??
Yes. Stop doing that.
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Old Fri, Jan-12-2018, 08:25:40 PM   #34
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Default Re: Mitigating Cold Start Wear

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Originally Posted by Obioban View Post
S54 Z3Ms, with their 7600rpm redlines but identical hardware, do not suffer the same bearing wear as our 8000rpm S54s.
Actually they seem to. BMW just didn't do the recall on them
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Old Fri, Jan-12-2018, 08:26:17 PM   #35
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Default Re: Mitigating Cold Start Wear

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Actually they seem to. BMW just didn't do the recall on them
Recall was due to the production defect, not wear, no?
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Old Fri, Jan-12-2018, 08:26:48 PM   #36
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Default Re: Mitigating Cold Start Wear

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Originally Posted by gam3cock View Post

Is that bad??


Just drive it lightly and gingerly to warm it up. I think i read that idling doesnít allow oil to get into all places of. Cold engine because there is not enough oil pressure to splash all over. Because the engine runs cold for longer the rich fuel mixture will prematurely wear out and contaminate the catalytic converters as they canít warm up fast enough to do their job. Once you drive off you think you can drive like a madman forgetting the fact that every other moving part of the car hasnít been warmed up yet like your transmission/diff fluid which is still cold.

The OEM RPM warmup light setting sets the lights really low for oil temp. It does follow the oil temp but BMW coded the lights to start turning off at 10įC to a max of 60įC. I custom set mine (from MSS5x Binary Mod Tool) to start turning off at 30įC and end at 80įC.
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Old Fri, Jan-12-2018, 08:36:27 PM   #37
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Default Re: Mitigating Cold Start Wear

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Originally Posted by mrgizmo04 View Post
Per what Ian said, I think there is some oil starvation going on at higher rpms on these engines, so the closer and the more frequently you want to play around 8k rpm (or even above), the faster your bearings will wear/fail.

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I havenít experienced any starvation or cavitation with a 9k redline & stock pump. Plus, VANOS would lag big time if this happened at high rpm; Not to mention possible valve clipping.


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Old Fri, Jan-12-2018, 08:44:05 PM   #38
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Default Re: Mitigating Cold Start Wear

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Originally Posted by Obioban View Post
Recall was due to the production defect, not wear, no?
Bmw elected not to do it on the Z3M, using the lower rpm limit as a justification. But they still go through them relatively quickly
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Old Fri, Jan-12-2018, 09:01:51 PM   #39
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Default Re: Mitigating Cold Start Wear

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Originally Posted by SliM3 View Post
I havenít experienced any starvation or cavitation with a 9k redline & stock pump. Plus, VANOS would lag big time if this happened at high rpm; Not to mention possible valve clipping.


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I think (and this is a hypothesis) that at some point you hit volumetric flow capacity of the runners and the pump at the pressures pump/lubrication system can support. With higher crank speeds you would run into that max. You obviously don't run the car at 8 or 9k all day, but you do get longer times up there in higher gears and at higher vehicle speeds. Track cars def wear them out quicker. What exactly causes it, that is unknown.

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Old Fri, Jan-12-2018, 09:37:40 PM   #40
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Default Re: Mitigating Cold Start Wear

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Originally Posted by Obioban View Post
Since the s54 bearing wear seems to track with high RPM usage and not with cold starts, I'm going to skip the pre oiler. Feels like a solution to a non problem, to me.

Strong proponent of KISS, here.
I agree completely, a pre oiler is overkill for most engines, just throwing it out there as another option for Doogan.
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Discussing Mitigating Cold Start Wear 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)