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Old 07-07-2007, 03:06 AM   #1
FD777
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Member#: 84820
Join Date: Apr 2005
Chapter/Region: BAIC
Location: Santa Clara/Sunnyvale, CA
Vehicle:
2005 WRX Sedan
Crystal Gray

Default Oil Analysis - Castrol Syntec GC 0w-30 - 4000mi - 2005 Subaru WRX

Driving details:
Always let the car warm-up: ~3k RPM shifts when the she's cold and ~4k RPM shifts when she's warm.
Then there's the occasional spirited driving and hard accelerations.
Car averages two 7-mile city trips on weekdays and highway trips on weekends.

Auto-Xed the car once... only got 3 runs in

Personal Comments:
Copper down: no track events.
Silicon up: nearing my 30K mark so the air filter will be changed soon.

Current UOA:
Code:
OIL FILTER: Subaru OEM Toyo Roki - 15208AA100
AIR FILTER: Subaru OEM - 16546AA020

EQUIPMENT MAKE: Subaru			OIL USE INTERVAL: 4,000 Miles
EQUIPMENT MODEL: 2.0L Turbo		OIL TYPE & GRADE: Castrol Syntec GREEN 0W/30 (Gas)
FUEL TYPE: Gasoline (Unleaded)		MAKE-UP OIL ADDED: 0.75 qts
 
0.5 to 1.5 quarts of added oil during a ~4000-mile oil change will affect wear metals a little 
but not much. The wear metals in this latest oil sample from your Subaru looked pretty good and we 
are encouraged in the decline in copper. All of the other wear metals read very close to the universal 
averages, which are based on 4,750 miles of oil use for this type of engine. The TBN was 5.9, plenty 
of active additive left in the oil if you ever wanted to extend your oil use. No contaminants were found 
and the oil's viscosity was normal. Looks good at 27,000 miles!
 
 
ELEMENTS IN PARTS PER MILLION (PPM)
 
MI/HR ON OIL		4000		4,100		4,000		Unit /		Universal Averages
MI/HR ON UNIT		27,000		23,100		15,000		Location
SAMPLE DATE		06/08/07	03/02/07	04/08/06	Averages
 
ALUMINIUM		2		3		2		2		3
CHROMIUM		0		0		1		0		1
IRON			5		6		4		5		8
COPPER			9		12		7		9		5
LEAD			1		1		2		1		5
TIN			0		0		0		0		1
MOLYBDENUM		1		2		67		23		76
NICKEL			2		2		0		1		0
MANGANESE		1		1		0		1		1
SILVER			0		0		0		0		0
TITANIUM		0		0		0		0		0
POTASSIUM		0		0		0		0		1
BORON			0		2		35		12		73
SILICON			12		11		9		11		8
SODIUM			0		4		4		3		6
CALCIUM			2902		2923		2171		2665		2397
MAGNESIUM		154		134		11		100		106
PHOSPHORUS		823		785		601		736		719
ZINC			1023		928		713		888		854
BARIUM			0		0		0		0		0
 
 
		cST		SUS		VISCOSITY	cST		SUS		FLASHPOINT	FUEL%	ANTIFREEZE%	WATER%		INSOLUBLES%
		VISCOSITY	VISCOSITY	INDEX		VISCOSITY	VISCOSITY	IN F
		@ 40 C		@ 100 F	@ 100 C	@ 210 F
 
VALUES										58-65		>365		<2.0	0		<0.1		<0.6
SHOULD BE
 
TESTED										64.8		390		<0.5	0.0		0.0		0.2
VALUES WERE
UOA posts:
Nasioc:
03/02/07 Castrol Syntec 0w-30 - 4100 miles
04/08/06 Mobil1 10w-30 - 4000 miles

Bitog:
06/08/07 Castrol Syntec 0w-30 - 4000 miles (Current)
03/02/07 Castrol Syntec 0w-30 - 4100 miles
04/08/06 Mobil1 10w-30 - 4000 miles
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Old 07-09-2007, 04:44 AM   #2
drees
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Member#: 25905
Join Date: Oct 2002
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2003 Silver Wagon
Tuned with Enginuity

Default

Looks perfect! Uou can easily extend the oil change interval out if you wanted to to save a bit of cash and the hassle of changing your oil so frequently.
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Old 07-10-2007, 03:21 AM   #3
FD777
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Member#: 84820
Join Date: Apr 2005
Chapter/Region: BAIC
Location: Santa Clara/Sunnyvale, CA
Vehicle:
2005 WRX Sedan
Crystal Gray

Default

Yah, I just wanted a comparable mileage/time to my last OCI (high copper). I'm confident with extending the OCI if I don't track or autox too much.
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Old 07-10-2007, 11:27 AM   #4
mikeythejew
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Member#: 141672
Join Date: Feb 2007
Vehicle:
07' wrx
Mothballed until winter

Default

Coach me, where does the copper and silicon come from? Im going to shoot for a 7500 mile oci, and use blackstone to test the oil and tbn. I havn't researched it, but the one thing that concerns me is maybe the boxer engine is more prone to see coolant in the sample with some cars.
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Old 07-10-2007, 01:31 PM   #5
FD777
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Member#: 84820
Join Date: Apr 2005
Chapter/Region: BAIC
Location: Santa Clara/Sunnyvale, CA
Vehicle:
2005 WRX Sedan
Crystal Gray

Default

http://www.blackstone-labs.com/gasol...port_expl.html

In my case, blackstone thinks the excessive copper came from my turbo combined with two track events. (Although I'm not sure which part of my turbo would contribute to that...)

Silicon typically comes from dirt in the air. Could be an old filter, poorly sealed filter, crappy filter, maybe you drive on dirt roads, etc.

I haven't seen too many UOAs with coolant issues. If anything, most have shearing issues (e.g. Xw-30 becoming a Xw-20)
In terms of shearing, I had no problems with Mobil1 10w-30. But I stand against a very large and angry mob by saying that... And don't get people started on the spun bearings!
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Old 07-11-2007, 07:36 PM   #6
MarkRx
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Member#: 42242
Join Date: Aug 2003
Chapter/Region: TXIC
Location: ATX
Vehicle:
2006 STI
White

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so tell me why are they not making this oil anymore if it's in such high demand??
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Old 07-11-2007, 07:58 PM   #7
mikeythejew
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Member#: 141672
Join Date: Feb 2007
Vehicle:
07' wrx
Mothballed until winter

Default

Quote:
Originally Posted by MarkRx View Post
so tell me why are they not making this oil anymore if it's in such high demand??
In comparison to other oils that retailers carry, it's turnover is low. This is kinda like the old kodak ISO 25 speed print film once offered. Still better then anything made today, but axed by kodak because of low sales. Like or it not, that's reality.
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Old 07-11-2007, 08:59 PM   #8
FD777
Scooby Newbie
 
Member#: 84820
Join Date: Apr 2005
Chapter/Region: BAIC
Location: Santa Clara/Sunnyvale, CA
Vehicle:
2005 WRX Sedan
Crystal Gray

Default

I've joined a few another car forums for fun - 350Z, G35, LS1, Evo, Honda, etc.
All of them mention GC and Bitog!
It's only been growing in popularity, I have no idea why Castrol pulled it out now.

But yes, relatively speaking, the demand for GC is low.
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Old 07-25-2007, 02:56 AM   #9
MarkRx
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Location: ATX
Vehicle:
2006 STI
White

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so what's everyone using now that GC is gone?
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Old 07-25-2007, 11:40 AM   #10
bluesubie
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Chapter/Region: Tri-State
Location: N.J.
Vehicle:
04 FXT

Default

4,000 mile OCI on GC?! You should be slapped!

Looks great! GC is diminishing because we are ignorant about oil. Even a guy at Autozone once asked me what car I was running such a thin oil in.

I had good luck with Motul 8100 5W30 this past winter, but I can't bring myself to run something that thin (10.0 cSt) in summer with my trips to SC, off-roading and a heavy foot. Elf Excellium 0W30 and M1 10W30 High Mileage are a couple of other rare 30 weights that meet ACEA A3 like GC. I think Redline would also be a good choice or any high HTHS oil.

I'm hoping my AZ re-stocks GC. They were out the last time I stopped by, but the tag was still on the shelf.

-Dennis

Last edited by bluesubie; 07-25-2007 at 01:58 PM.
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