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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, Feb-21-2014, 05:39:39 PM   #31
kpkicker14
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Default Re: Motor Oil Basics

tl;dr

Cliffs -synthetic for the win every time.?
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Old Fri, Feb-21-2014, 07:42:36 PM   #32
nrubenstein
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Default Re: Motor Oil Basics

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Originally Posted by kpkicker14 View Post
tl;dr

Cliffs -synthetic for the win every time.?
The only reason not to run synthetic is in an old ass sludged up motor. Synthetic will tend to dissolve the sludge, which is likely to result in oil leaks.

Other than that, it's better in every way. It protects better cold. It protects better hot. It lasts longer. The only downside is that it costs more up front.
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Old Fri, Feb-21-2014, 09:37:29 PM   #33
deepinya
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Default Re: Motor Oil Basics

Ive been wanting to try m1 0w-40 cause these winter starts are worrisome. Will send in an oil analysis for comparison.

Im not tracking my car so my biggest worries are startup.

This article was a great, albeit lengthy, read
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Old Fri, Feb-21-2014, 09:45:51 PM   #34
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Default Re: Motor Oil Basics

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Originally Posted by nrubenstein View Post
In a vacuum, sure. However, 0w40 oils will tend to be thinner and less shear stable than, say, 5w40 equivalents. (You can easily see the former in redline's spec sheets. The latter comes out in oil testing.) The thing to remember is that these notional thicknesses actually cover a pretty large range.
Can you explain why they are less shear stable? It seems to me that shear stability has little to do with weight alone and what matters is operating temp and weight.
0w40 and 5w40 should have near identical shear stability at operating temps no?
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Old Sat, Feb-22-2014, 03:40:11 AM   #35
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Default Re: Motor Oil Basics

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Can you explain why they are less shear stable? It seems to me that shear stability has little to do with weight alone and what matters is operating temp and weight.
0w40 and 5w40 should have near identical shear stability at operating temps no?
Shear stability is how long and how well the oil stays at the rated weight. The wider the spread between the base/cold weight and the hot weight, the more that the oil has been tweaked/treated/added to. When the viscosity improvers are sheared apart (that's the shear), the hot weight of the oil drops.

TWS, for example, almost instantly drops a grade in use.

5w40 is more likely to stay a 40 weight when hot than 0w40.
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2006 GMC Sierra 2500HD 4WD - Duramax LBZ/Allison
2002 BMW M3 Alpinweiß/Black - Konis, AS SSK, JBL MS-62C, IDQ-12v3, JBL MS-8
1999 323i KP/GTS2 Alpinweiß - Hood-in-the-windshield mod
1995 M3 Dakargelb/Black - S50B32/S6S420G, Diffsonline 3.91, H&R/Bilstein, Hotchkis, AS SSK, etc...
1990 325is Brilliantrot/Tan - GC/Bilstein, Sway
1989 325is Alpinweiß/Black - Decontenting...
1989 M3 Alpinweiß/Black - S62B50 in progress...

Hers: 1996 Porsche 911 Turbo Black/Black - UMW LTW Flywheel, Bilstein
Hers: 1988 325iX Coupe Diamondschwartz/Black 5spd - Korman lengthened front driveshaft, 272 cam, H&R/Bilstein

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Old Sat, Feb-22-2014, 01:29:25 PM   #36
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Default Re: Motor Oil Basics

In layman's terms...I'm reading that as the biggest concern and the thing you have the least control over is cold start wear.

But I only read the first part...sub'd to read the rest.
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Old Sat, Feb-22-2014, 05:07:24 PM   #37
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Default Re: Motor Oil Basics

Interestingly after 36 posts to this thread, no one mentioned their score on the final…well, I’m not going to break that precedence….
I like the theory and how it was presented and the author acknowledges there is no replacement for testing. However, it has changed my perspective on oil viscosity with respect to the internal combustion engine. Good read. I’m getting an oil pressure gage.
Crap, I haven’t ran the engine more than a hour since December and 10 hrs. since track day and an oil change in September, and now I feel obligated to change the oil this spring! Knowledge sucks sometimes!
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Old Sat, Feb-22-2014, 08:57:49 PM   #38
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Default Re: Motor Oil Basics

It was a good read, I have a diesel truck (duramax) that sounds absolutely awful when it starts and it's cold outside. I let it idle a minute or so, then take it really easy but those first few starts and stops are rough. The oil pressure is high (almost double) till it warms up.

No score on the final, didn't take it...
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Old Sun, Feb-23-2014, 12:31:58 AM   #39
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Default Re: Motor Oil Basics

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Originally Posted by hefffree View Post
It was a good read, I have a diesel truck (duramax) that sounds absolutely awful when it starts and it's cold outside. I let it idle a minute or so, then take it really easy but those first few starts and stops are rough. The oil pressure is high (almost double) till it warms up.

No score on the final, didn't take it...
Possibly the number one benefit of an oil pressure gauge in my truck was the way that it easily and obviously displays the benefits of switching to synthetic. IIRC, cold start oil pressure with the Amsoil 15w40 is something like half of what it is with the 1300 Super.
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[B]2011 BMW M3 (E90) Alpinweiß/Cloth - Slicktop stripper, TCK D/A Konis, AS SSK
2006 GMC Sierra 2500HD 4WD - Duramax LBZ/Allison
2002 BMW M3 Alpinweiß/Black - Konis, AS SSK, JBL MS-62C, IDQ-12v3, JBL MS-8
1999 323i KP/GTS2 Alpinweiß - Hood-in-the-windshield mod
1995 M3 Dakargelb/Black - S50B32/S6S420G, Diffsonline 3.91, H&R/Bilstein, Hotchkis, AS SSK, etc...
1990 325is Brilliantrot/Tan - GC/Bilstein, Sway
1989 325is Alpinweiß/Black - Decontenting...
1989 M3 Alpinweiß/Black - S62B50 in progress...

Hers: 1996 Porsche 911 Turbo Black/Black - UMW LTW Flywheel, Bilstein
Hers: 1988 325iX Coupe Diamondschwartz/Black 5spd - Korman lengthened front driveshaft, 272 cam, H&R/Bilstein

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Old Sun, Feb-23-2014, 06:33:20 PM   #40
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Default Re: Motor Oil Basics

Quote:
Originally Posted by nrubenstein View Post
Possibly the number one benefit of an oil pressure gauge in my truck was the way that it easily and obviously displays the benefits of switching to synthetic. IIRC, cold start oil pressure with the Amsoil 15w40 is something like half of what it is with the 1300 Super.
Nice, I see the LBZ in your sig, I have an 07.5 LMM. I've only had it for one oil change, and I put Amsoil in it. It's almost time for another.
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Discussing Motor Oil Basics 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)