2003 BMW 330 Ci factory fill Differential oil 38,000

Messages
1,053
Location
Indiana (IN)
2003 BMW 330 Ci differential UOA Date: 08-05-2005 Miles on sample: 38000 Dates: from Feb 2003 to August 2006 Lab: Blackstone Factory fill – probably Castrol SAF-XO 75w-90
code:
 				Universal Averages
Aluminum		0		    8
Chromium		1		    2
Iron		      240                 322
Copper			2		   15
Lead			0		    7
Tin			3		    1
Molybdenum		0		    5
Nickel			0		    3
Manganese	       10		    7
Silver			0		    0
Titanium		0		    0
Potassium		1		    6
Boron		      216		  128
Silicon			7		   61
Sodium		        4		   15
Calcium		        7		  585
Magnesium		3		   60
Phosphorus	     1452		 1118
Zinc			6		  326
Barium			3		   19

SUS Viscosity @ 212		74.5
Flashpoint 	F		410
Water		%		0.0
Insolubles  	%		0.1
 

Lab Comments: This sample looks good. The universal averages column shows typical wear from a differential after about 60,000 miles. You changed the oil, though it probably could have stayed in use longer. Metals all read below averages and show no problems at all. Insolubles (solids) were low at 0.1% which is great. No moisture or other contaminants found. The viscosity was normal for a 75W/90 oil. We think you’ll be able to leave the next oil in place longer than 38K miles unless BMW calls for it to be changed to keep the warranty valid. My comments: The car has 2 trips to the drag strip for a total of about 8 runs, two track days and about 10 Auto cross events. I changed to Motul Gear 300 75w/90. I chose it because it starts a little thinner than most other gear lubes, is full synthetic and has a high Viscosity index giving a lower viscosity at lower temps.
code:
Lubes I considered:	
      Motul 300 	   Motul		Castrol		Mobil 1 	  	Red Line	Castrol
		          MotylGear	         SAF-XO					Syntec

	API GL4 GL5      API GL4 GL5	         API GL5       API GL-5/MT-1             GL5+        API GL-5/MT-1
            MIL-L-2105D        MIL-L-2105D


Vis 40C 	72.6	      81	 	103.7		   106		    115	
Vis 100C	15.2	      14.5  	        15.7		   15.2		    16.4		15.0
VI		222	     188	  	162		   150		    155
Pour pt C	-60	     -48	  	-51		   -46		    -45
Flash Pt C	200          200	  	220		   175		    227		         198

 

Comparison of viscosity (cSt) of Motul and redline at different temps: Calculator link : http://www.geocities.com/CapeCanaveral/3655/VI.html
code:
	Motul		Redline
 0 F	1292		5491
30 F	  453		1288
60 F	  194		 411
90 F	 96.5		 164
120 F	 54.3		78.6
150 F 	 33.4		42.7
 

 
Messages
1,759
Location
Elizabeth City NC
Don't see many diff analysis. This one looks great to me. The iron seems high but is less than universal average so must be no problem. Excellent considering drag racing would put the most stress on a diff in my opinion.
 
Messages
5,785
Location
Dixie
The last time I checked, "cold" weather in Houston meant about 50F. LOL! I don't think that's even a consideration in this particular case. I'd be looking at high temp performance and wear protection under controlled conditions. I would have also considered the Amsoil Severe Gear, 75w-90. I think you'll find it protects better than most of the candidates you've looked at. TS
 

shanneba

Thread starter
Messages
1,053
Location
Indiana (IN)
Well TS the average low here in Houston never gets below 45 but I usually drive less than 5 miles to work so my diff doesn't get up to temp. If I take the long long way to work it's about 8 miles, straight to work is about 0.8 miles. I just posted the info on vis at temps for those that were in the frozen north. Red Line is very popular here with the BMW club members.
 
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