GC- Cold Temp. Viscosity

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580
Location
Ontario Canada
Guys. I've now switched to GC for my BMW. I changed over last month before storing car. My question is about cold temp. viscosity. I read one post here that it is thicker than a 5w30 at most temps. So if it's -22 C (-10 F) to 0 C (32 F), a 5w30 is better than a 0w30 because a 0w30's advantage is in extreme cold (Artic like tempertures.) How thick is it? I always thought that all 0w30 oils had better normal cold starting flow than 5w30 oils. On a side note, I just saw the new 5w40 Bottles of Syntec which states on the back: European Formula now Blended in The USA. [Frown] Will it be the same for the 0w30? [Frown] If so, then everyone will be stocking up on the gold. PS. I've built up a little stash of 22 bottles of the green. [Big Grin]
 
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357
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none
Those are great questions which probably can't be answered by the rank and file amateurs here. I saw 427Z06 post (calculator based chart) but mistook it for actual oil specification. Does anyone know if it matches how oils perform at those temps? A simple answer to your question is (which is simply my conclusion FWIW) - go with a authentic synthetic because it likely will reduce oxidation on the internals of a engine in storage due to it's cling behavior. 5w vs 0w is probably not as an important a factor.
 
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56
Location
Pittsburgh, PA
My guess is that due to Euro-$ exchange rates, oil companies are moving as much "production" over here as they can. I seriously doubt this will result in lower quality product.
 

2KBMW

Thread starter
Messages
580
Location
Ontario Canada
Steven88. The new 5w40 Syntec is now made or blended in the States which means no more from Belgium. I was told that the 0w30 grade will also be made in the US. That means no more GC. I know how people feel about Castrol products being GRP 3 so I don't feel the US stuff is the same. And if any of you think a 0w30 cannot be a GRP 3, think again. I've seen 0w30 oil from Petro Canada (one of the biggest producers of GRP 3 oil) years ago,even before Castrol. I would feel better putting oil from Germany or Belgium in my BMW. [Smile]
 

JAG

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5,320
Location
Fredericksburg, VA
Try to find a primarily Group 3 0W-30 oil that meets all of these: BMW LL-01, VW 502.00, 505.00, 503.01, GM LL-A-025 and LL-B-025, MB 229.1, 229.3, 229.5, ACEA A3,B3,B4. I've tried and could not. Meeting all of those specs requires the oil to be top notch. Anyway, a little amount of Group 3 mixed in does not doom the oil to inferiority because an oil's performance is a function of both basetocks and the additives and Group 3 is not that far off PAO's in performance. An oil with lesser basestocks (some Group 3 mixed with PAO) but great additives can and has outperformed some 100% PAO oils. The thread recently posted about 5W-40 oil tests done by the Czechs shows this. Magnesium additive compounds come in many varieties and those used in today's oils are different than what they used to be, according to one of our forum experts: Molekule. Castrol is a blender, not a raw material producer like Mobil or Chevron. Where Castrol does their blending tells us nothing about what materials they use.
 
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488
Location
Vermont
Hmm I should probably dig up my notes and start a new thread in the general oil forum, but... Last winter when I lived in central MA we had some of the lowest temps I've seen in a while. One morning when it was -5 degrees outside, I didn't dare shut the garage for fear of the doors freezing shut. In the morning the garage temp was 2 degrees inside! So I went over to my oil shelf and did some quick non-scientific tests, ie picked up a quart of each variety and shook it gently to see how the flow was. I recall that the GC, both gold and green, and PP 5W-20, were the best flow by a large margin. Not sure what else I had offhand, I recall I had M1 5W-20 and -30, PP 5W-30, plus Castrol, Napa, and Chevron dinos. Hope that helps a bit...very un-scientific but nonetheless that is what I observed.
 
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3,833
Location
NEPA
GC is a thick 30 that is probally more like 5w-40 at most temps, except the super-cold. If you want thinner at cold temps, get M1 0w-40.
 
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40,661
Location
Great Lakes
Quote:
GC is a thick 30 that is probally more like 5w-40 at most temps, except the super-cold. If you want thinner at cold temps, get M1 0w-40.
What's "cold temps"? Shall we say freezing point (0 deg. C)? At that temp, M1 0w-40 has a visc. of about 600 cSt, while the GC has a visc. of about 608 cSt, using the calculator above, so I'd say the difference is undetectable.
 
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1,053
Location
Indiana (IN)
I used an online viscosity calculator to compare GC against Mobil 1 0w-40 a while back. I used the specs I found for Castrol Edge 0w-30. Viscosity and Viscosity Index (VI) Calculation Code:
  
		
Temp	Castrol 	Mobil 1
F	Syntec	
	0w-30	0w-40
Vi	167	187
100C	12.2	14.3
40C	72	80

	cSt	
-40	28357.7	19743.0
-30	14234.7	10603.0
-20	7591.9	5998.0
-10	4278.2	3558.0
0	2527.6	2199.0
10	1560.7	1412.0
20	1001.1	938.0
30	665.4	642.0
40	456.5	452.0
50	322	326.0
60	233.2	241.0
70	172.8	182.0
80	130.8	140.0
90	100.9	109.0
100	79.3	87.2
110	63.3	70.3
120	51.2	57.5
130	42	47.5
140	34.9	39.8
150	29.3	33.6
160	24.9	28.7
170	21.3	24.7
180	18.4	21.4
190	16.1	18.8
200	14.1	16.5
210	12.4	14.6
220	11.1	13.1
230	9.9	11.7
240	8.9	10.5
250	8	9.5


 
Messages
40,661
Location
Great Lakes
Quote:
What about at -20 to -30 C and where did you get that information from? I've been looking lately...
Code:
TEMP ... M1 0w-40 ......  GC 0w-30 
.
-20C ..... 2675 ............ 3046
-30C ..... 6765 ............ 8375

Use the calculator linked above. shanneba posted the two reference values (at 40C and at 100C) that you need to punch in in order to get the desired value at X degrees C. It's an approximation though. From the figures above it shows that GC actually thickens up faster than M1 0w-40. Whether that's true in reality, I have no idea. I've never used either of these oils in temps lower than about -10C at which temp both flowed just fine.
 
Messages
58
Location
USA
Quote:
From the figures above it shows that GC actually thickens up faster than M1 0w-40. Whether that's true in reality, I have no idea.
I was recently trying to decide between M1 0W-40 or GC 0W-30. I was concerned about the M1 being too thick during warmup, so I did a few quick experiments trying to determine the relative thickness of the oils at various temps. by timing how long it took for the oils to pour out through a hole in a small bottle (This actually remotely resembles a 'real' way to measure viscosity). You should take the results with a big grain-o-salt, since I just used stuff laying around my basement... Hopefully, it should at least be good for relative thickness comparison. But this is what I measured (Using M1 0W-40 numbers at 100C and 40C as a reference) Code:
                         :    1F      :   30F   :   69F   :  104F
Catrol Syntec Blend 5W-30:  74.1 Secs : 566 cSt : 150 cSt : 62 cSt  
Castrol GC 0W-30            74.3 Secs : 586 cSt : 171 cSt : 73 cSt
M1 0W-40                    96.0 Secs : 643 cSt : 183 cSt : 79 cSt
Castrol Syntec 5W-40        99.3 Secs : 773 cSt :   ?      :   ?

 
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