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Old 03-05-2008, 12:04 PM   #1
AndyH
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Default Used Oil Analysis - Pennzoil Platinum 5W-30 - 2005 Subaru WRX STi

Posting my latest UOA of Pennzoil Platinum 5w-30 per the request of a fellow Subaru owner who regularly posts over on the Bob is the Oil Guy (BITOG) forums, and asked me to post a copy over here on NASIOC as well.

Vehicle: 2005 Subaru Impreza WRX STi
Engine: 2.5L Turbo
Engine Mods: COBB Stage 1 (ECU reflash providing an additional 25 HP)
Fuel Type: Gasoline (Unleaded); 92 Octane
Air Filter: OEM Paper
Oil Filter: OEM (Part #15208AA080)
Oil Capacity: 4.8 Quarts
Make-Up Oil Used: None
Additives Used: One treatment of Techron fuel system cleaner approx. 200 miles prior to oil change.
Oil in Use: 08/03/07 - 02/24/08 (206 Days)
Driving Conditions: I would consider myself a semi-aggressive driver in general. Vehicle is used for commuting 17 miles to/from work, 90% highway driving at speeds between 60 and 80 MPH. Also driven on weekends around town. No racing or other track driving.



Blackstone's Comments:
Wear continued to increase in the latest sample from your STI, though nothing is high enough to point to an obvious mechanical problem developing. If you did any hard driving or racing on this fill that could explain the increase. A trace of fuel was found but this level isn't a problem. The viscosity of the oil remained normal, despite the fuel dilution, and no other harmful contaminants were found. The TBN read 2.8 so you had some active additive remaining. At 33,232 miles we have no new problems to report.

My Comments:
My potassium level continues to drop, so I feel pretty sure that I don't have any major coolant leaks in the engine. I will continue to monitor it and hope that it stays the same or drops off further toward zero.

The air filter was replaced as part of the 30,000 mile service ... no change in silicon level. At least it stays pretty consistent from UOA to UOA.

I have to admit that I'm slightly underwhelmed at the results of this UOA. Slightly worse iron and copper levels, slightly better lead level. The low flashpoint is disappointing...perhaps I do have some fuel dilution issues.

BTW, the oil was replaced with more Pennzoil Platinum 5w-30 and an OEM oil filter. I'll plan to run it around 5,000 miles and then I think I'm going to switch back to German Castrol as I have a decent size stash to use up.

I don't post much these days on NASIOC, so I may not respond to any questions posted here for quite some time. Feel free to comment in my thread over on BITOG if you'd like.
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Old 03-05-2008, 12:30 PM   #2
shemoves
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When it warms up over there, try a good synthetic 40 weight and see if that helps (I know that GC is almost a 40 weight) with wear. I almost exclusively use Red Line 10w40 in my STi. I tried GC once and greatly preferred the Red Line. Not saying you need to bump up to a really expensive oil like the RL, just see what a thick weight does. Also, the results from the Mobil Clean 7500 seem to have been the best, but it seems to be bit of a give and take between that and the GC. I do like the consistent results of the GC though.
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Old 03-05-2008, 02:29 PM   #3
AndyH
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Quote:
Originally Posted by shemoves View Post
When it warms up over there, try a good synthetic 40 weight and see if that helps (I know that GC is almost a 40 weight) with wear. I almost exclusively use Red Line 10w40 in my STi. I tried GC once and greatly preferred the Red Line. Not saying you need to bump up to a really expensive oil like the RL, just see what a thick weight does. Also, the results from the Mobil Clean 7500 seem to have been the best, but it seems to be bit of a give and take between that and the GC. I do like the consistent results of the GC though.
I've been tempted to try a thicker weight, especially for the warmer months but haven't yet gone thicker than the GC. I've been trying to stick with readily available synthetic oils that I don't have to mail-order. I may give the Mobil 1 5W-40 a try for one 5,000 mile interval and see how it works out.

As far as the results from the Mobil Clean 7500, keep in mind that was a shorter 2,480 mile interval. But I agree, it did seem to perform pretty well ... all things considered.
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Old 03-05-2008, 02:41 PM   #4
bluesubie
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OMGHi2U

Quote:
Originally Posted by AndyH View Post
Posting my latest UOA of Pennzoil Platinum 5w-30 per the request of a fellow Subaru owner who regularly posts over on the Bob is the Oil Guy (BITOG) forums, and asked me to post a copy over here on NASIOC as well.


Not bad for $5.00 worth of oil.

I don't know if you saw it, but there was a good RL 5W40 uoa on a Stage 4 bugeye posted here and bitog recently. But that probably doesn't fit the bill for being "readily available" though. Too bad Pennzoil Platinum 5W40 is as rare as a green GC RS.
Here's the RL 5w40 uoa.

-Dennis

Last edited by bluesubie; 03-05-2008 at 02:47 PM.
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Old 03-05-2008, 02:47 PM   #5
FD777
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Haven't seen you post in a while!

The UOA wasn't stellar, but at least your giving PP another shot. One sample doesn't say too much.
I'm in a similar situation: got a small stash of GC to consume before I move on. Could try something new or switch to GC gold.
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Old 03-05-2008, 03:18 PM   #6
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Is this with GC Green or Gold...early gold, or current gold?
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Old 03-05-2008, 03:51 PM   #7
AndyH
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Originally Posted by JamesWilson View Post
Is this with GC Green or Gold...early gold, or current gold?
All GC "green". I do have some "gold" GC in my stash as well. I will start using that after my stash of "green" GC is depleted.
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Old 03-05-2008, 05:11 PM   #8
bluesubie
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What's your estimate on your total oil stash? I never keep more than 6 quarts of oil around since my garage is a mess. Green GC was gone from my area as soon as the gold came out.

-Dennis
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Old 03-05-2008, 05:36 PM   #9
AndyH
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Dennis,

I think I have something around 40 quarts of GC left, most of it "green" and some "gold". I bought four 6-pack cases of "green" GC from a local guy for a grand total of $75 ($3.13/quart) last winter which helped to supplement my supply from previous AutoZone raids. I also have a couple odd quarts of PP 5W-30 along with some M1 0W-40 which I use in my GF's Audi A4 1.8t.

-Andy

Last edited by AndyH; 03-05-2008 at 05:49 PM.
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Old 03-07-2008, 12:33 AM   #10
TedMeyer
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Lotsa interesting stuff here, thanks for posting. I've just recently started researching this stuff, but my thought is to go back to the GC -- seems like your chromium, iron and copper levels were better. Def interesting to see the final viscosity for all those 30-wt oils, which really shows the stability of the GC (and that all 30 wt oils are NOT created equal).

That Redline UOA Bluesubie referenced is mine, and I'm running Pennzoil 5w30 now, so we'll have another point of comparison when I do my change (though I might use some of that EngineRx cleaner starting with this change -- I guess I can pull a sample before-hand). My iron levels were similar -- will be interesting to see how mine change. But of course I've got the higher lead levels which seem to be typical with the Redline.

OEM oil filter results were similar to mine, which is to say very good. And I'll also throw in there the silicon levels with the OEM filter are the same as with my 5-year-old K&N....
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Old 03-07-2008, 11:07 AM   #11
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Quote:
Originally Posted by TedMeyer View Post
... Def interesting to see the final viscosity for all those 30-wt oils, which really shows the stability of the GC (and that all 30 wt oils are NOT created equal).

That Redline UOA Bluesubie referenced is mine, and I'm running Pennzoil 5w30 now, so we'll have another point of comparison when I do my change ...
You would think those conventionals would stay in grade for at least 3,000 miles, but not so. I wonder if PP 10W30 would have performed any better?

I wouldn't feel comfortable running PP 5W30 in summer or at the track (in both of your applications), unless it was a short oci. I'm scared of energy conserving oils. At least the PP stayed in grade.

-Dennis

Last edited by bluesubie; 03-07-2008 at 11:18 AM.
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Old 03-07-2008, 01:20 PM   #12
JamesWilson
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+1 for oil stashes, I've used all mine up now that I am poor Oops, I have a 1-gallon jug of M1 5w-40 Truck & SUV, a 5-ltr "mix jug" of Motul/M1/Elf/GTX Startup, and a quart of M1 0w-30 AFE....+1 for cleaning out the garage!!

Found a great deal on 60% off Mobil 1 M-112 filters (the discontinued Subaru size, full thread engagement) so I have 3 or 4 of them
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Old 03-09-2008, 07:56 PM   #13
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Flash point tells you you have more fuel dilution than in previous UOAs, no matter what BS can or can't tell you. Nickel's awfully high, too. Wonder whether that's related to the fuel attack or an anomalous testing result?
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Old 03-10-2008, 12:05 AM   #14
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Thanks for posting your oil analysis. I recently started having them done and find it interesting to compare the analysis.

I have run the same oil in my car since about 10,000 miles. I started with Havoline 5W-30 and switched to Amsoil 5W-30 at 10k and have never changed the weight. I was using OE oil filters and an Amsoil Ea air filter, but just switched the air filter to a PureOne item because of the elevated silicone levels. I used the OEM air filter for 60 or 70 thousand miles.

I do a lot of long highway drives and do autox and track the car occasionally.

-Adam

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Old 03-10-2008, 11:05 AM   #15
bluesubie
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Quote:
Originally Posted by bulwnkl View Post
Nickel's awfully high, too.
An LGT owner on bitog was wondering if it could be an early warning that a crack is developing in the oil pickup tube. Hopefully not.

-Dennis
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Old 03-10-2008, 06:13 PM   #16
bulwnkl
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...and thus oil aeration is the source of the high nickel? Is that the assumption/musing?
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Old 03-10-2008, 10:30 PM   #17
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I think he was inferring that the pick-up tube may have nickel in it. I'm not sure. It was SubLGT.

Ahersh - Good report. You should start a new uoa thread.

-Dennis

Last edited by bluesubie; 03-10-2008 at 10:44 PM.
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