BMW "Synthetic" 5w-30 2011 BMW 335xi 7630mi

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Last free oil change at dealership so previous oil wasn't in long enough to justify a report. I did request TAN but they didn't do it. Not sure what's up with that. I have M1 0w-40 in there now, will change it out in 7500 miles. Old thread for last report is HERE
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Comment: We talked about the rough winter in last year's report, and Boston got slammed pretty hard again this year. 
Your BMW doesn't seem to mind, though. 
Metals were definitely higher than last time (most notably aluminum and iron, from pistons and steel parts), but some of 
that is just due to the longer oil run. The harsh winter may have had some effect, if the 
engine saw a lot of cold starts, but nothing is far enough out of line with averages to call a problem. 
The TBN is good at 3.7, so try 10,000 miles next, and we'll keep our fingers crossed for a milder winter this year!

MAKE/MODEL:	BMW 3.0L	(N55) I-6 Turbo	(N55) I-6 Turbo	
OIL		BMW 5w30	M1 0w-40	M1 0w-40	BMW 5w30
MILES IN USE	7630		1993		5520		5150
MILES		50284		42653		40660		35140
SAMPLE TAKEN	3/31/2015	6/30/2014	5/1/2014	11/16/2013
				
ALUMINUM	19		NA		6		8
CHROMIUM	1		NA		1		1
IRON		50		NA		24		21
COPPER		6		NA		3		3
LEAD		0		NA		0		1
TIN		0		NA		0		3
MOLYBDENUM	151		NA		104		140
NICKEL		1		NA		1		0
MANGANESE	3		NA		1		1
SILVER		0		NA		0		0
TITANIUM	0		NA		0		0
POTASSIUM	14		NA		2		2
BORON		75		NA		151		61
SILICON		6		NA		4		3
SODIUM		9		NA		3		6
CALCIUM		2397		NA		3239		2321
MAGNESIUM	18		NA		19		17
PHOSPHORUS	935		NA		989		850
ZINC		1112		NA		1176		976
BARIUM		0		NA		0		0
						
SUS VIS 210コF	63.2		NA		68.5		64.4
cSt @ 212コF	11.12		NA		12.56		11.44
FLASHPOINT コF	395		NA		415		420
Fuel		<0.5		NA		<0.5		<0.5
Antifreeze	0		NA		0		0
WATER		0		NA		0		0
INSOLUBLES	0.3		NA		0.2		0.4
TBN		3.7		NA		5.6		5.3
 
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JHZR2

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Where's all that iron coming from in an N55? I have a bunch of N55 uoas I need to get up.
 

89Rustang

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The iron is a bit concerning. It is more than double on only about 50% more miles. There were a lot of extreme cold starts so that could be it. I had the VANOS bolt recall done, but can't see how that would effect anything.
 

89Rustang

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Originally Posted By: JHZR2
Where's all that iron coming from in an N55? I have a bunch of N55 uoas I need to get up.
I believe the cylinders have iron liners.
 
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