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Old 05-14-2009, 09:59 AM   #1
Scooby Specialist
Member#: 143624
Join Date: Mar 2007
Chapter/Region: NESIC
Location: New England
14 FXTT (hers)
15 Legacy 2.5i Prem (his)

Default Cam2 5W/30, 3022, Subaru WRX STI

Here's a link to my factory fill UOA after 3560 miles.

Factory Fill UOA

Factory fill replaced with Wolfs Head HD 5W/30. I followed Terry Dyson's recommendation to run two relatively short drain intervals, and then sending a sample for him to analyze. Here is what I did after the first OCI in the form of Terry Recommended/what I did.

1. 1500 miles/1507 miles (used Cam2 5W/30 - Free oil change from Subaru)
2. 2500 miles/ 3022 miles (sent sample to Dyson for analysis.)

Here are the results (Factory Fill UOA/Current UOA):

Miles On Oil: 3022
Total Miles: 8091
Make-up Oil: None

Iron: 68/10
Chromium: 1/1
Lead: 15/1
Copper: 272/31
Tin: 26/0
Aluminum: 28/3
Nickel: 0/0
Silver: 3/2
Silicon: 117/12
Boron: 164/117
Sodium: 164/7
Magnesium: 22/14
Calcium: 2092/1639
Barium: 16/3
Phosphorus: 1150/937
Zinc: 1348/902
Molybdenum: 898/74
Titanium: 0/0
Vanadium: 0/1
Potassium: 0/0

Fuel: <1/1.51
Vis @ 100C cSt: 9.35/8.6
Vis @ 40C cSt: 52.0*
TAN: 1.36*
TBN: 2.6*
OXID: 13*
NIT: 8*
Water: 0
KF: 1353*
Soot: 0.03*
vndx: 143*
Glycol: 0*
Coolant: NO

* Not analyzed prior to current sample

Terry stated that his tests show larger particle sizes than that of Stavely, which could represent an even more significant decrease of certain metals, etc.

I did not burn a drop of oil over the entire OCI, which is good. Fuel dilution seems to be a problem. Just goes to show that Subaru's Severe service intervals for all Turbo-charged cars is pretty applicable if you're using the run of the mill dino 5W/30. I've got Rotella 5W/40 in there now, and may change based on Terry's recommendations. Any other thoughts?
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Old 05-14-2009, 03:05 PM   #2
Scooby Guru
Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
04 FXT


Wow, much better now but I'm still surprised at some of those levels from your factory fill. Did the dealer actually do the factory fill oil change? You're in good hands with Dyson.

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