Welcome to the North American Subaru Impreza Owners Club Wednesday September 17, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 10-21-2007, 12:08 AM   #1
alanlcit
Scooby Newbie
 
Member#: 71108
Join Date: Sep 2004
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2005 WRX STi
Silver

Default Used Oil Analysis - Castrol Syntec 10W40 - Subaru WRX STi, 2nd sample

A few months ago I posted my first Castrol Syntec UOA...this is the second one, and you can compare to the first below...

Driving style:
A few full throttle freeway onramp pulls. Don't take it quite all the way to redline (6500 max). I don't race the car, and I don't track it. I use the car as a daily driver, for both my commute and on longer trips.

Driving conditions:
This oil was used through the San Diego summer, with a few trips with temperatures in the upper 90's/low 100's.

Consumption:
Generally, the consumption has been a bit lower than it was with Mobil 1. For this 4500-mile interval, I used a total of 1.7qts (1.3qts makeup oil was added, plus 0.4qts short after the drain). I tend not to put much stock in the leaky gasket theory they propose, since the consumption has always been this way...wouldn't a leaky gasket/seal be noticeable from outside the engine as a leak?...I don't have any oil leaking from anywhere on the engine. I've always assumed that it just burns/evaporates.
For Mobil 1 with a 4500 mile interval, I would think I would have burned upwards of 2 quarts...probably 2.5. So a little improvement.

I'm now running Amsoil 5W30 (can't remember the exact letters of the oil-type...not the super long life variety) in my engine (it's cooled down again in San Diego now, so I think this will be ok)...we'll see how that does in a few months. Out of caution, I'll be changing that after 4k miles...then extend the interval if it all looks good.

* Registered users of the site do not see these ads.
alanlcit is offline   Reply With Quote
Old 10-21-2007, 07:32 AM   #2
mikeythejew
Scooby Specialist
 
Member#: 141672
Join Date: Feb 2007
Vehicle:
07' wrx
Mothballed until winter

Default

Your report looks good. Maybe some oil is leaking past a seal in the turbo and getting sucked into the engine?
mikeythejew is offline   Reply With Quote
Old 10-21-2007, 09:03 AM   #3
CynicX
Scooby Guru
 
Member#: 48199
Join Date: Nov 2003
Location: Maryland
Vehicle:
06 WRX
WRB

Default

Most likely the oil is going through a turbo seal and out the exhaust. Generally oil analysis have a hard time seeing a turbo seal problem...
CynicX is offline   Reply With Quote
Old 10-22-2007, 09:08 AM   #4
bluesubie
Scooby Guru
 
Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
Vehicle:
04 FXT

Default

Quote:
Originally Posted by alanlcit View Post
I tend not to put much stock in the leaky gasket theory they propose, since the consumption has always been this way...wouldn't a leaky gasket/seal be noticeable from outside the engine as a leak?...I don't have any oil leaking from anywhere on the engine. I've always assumed that it just burns/evaporates.
I agree. Even though your consumption is "normal" I don't think I would stick with the Syntec 10W40. The uoa looks good!

-Dennis
bluesubie is offline   Reply With Quote
Old 10-22-2007, 06:00 PM   #5
leecea
Scooby Guru
 
Member#: 37359
Join Date: May 2003
Vehicle:
2003 WRX

Default

Quote:
Originally Posted by bluesubie View Post
...I don't think I would stick with the Syntec 10W40.
I just switched to dino 10w40 a couple of changes ago (M1 5w30 previously), so I'm curious as to why you say NOT to stick with this oil.
leecea is offline   Reply With Quote
Old 10-22-2007, 07:25 PM   #6
Scoobie Steve
Scooby Specialist
 
Member#: 2289
Join Date: Sep 2000
Chapter/Region: Tri-State
Location: Bangor, PA
Vehicle:
1998 11.87@112mph
Subaru L Ver 6 STi Type R

Default

Your oil is most likely going in your intake like every other turbo subaru. They have the crappiest crank venting system known to man! Check your intercooler I bet its oily.
Scoobie Steve is offline   Reply With Quote
Old 10-22-2007, 09:29 PM   #7
bluesubie
Scooby Guru
 
Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
Vehicle:
04 FXT

Default

Quote:
Originally Posted by leecea View Post
I just switched to dino 10w40 a couple of changes ago (M1 5w30 previously), so I'm curious as to why you say NOT to stick with this oil.
At less than 5k, the oil should have done a little better with consumption for synthetic IMO. I definitely wouldn't run conventional 10W40 past 3k miles. It will shear very quickly unless you're running something with a robust additive pack, like a diesel oil. Although it's better than running conventional xW30 and having that shear to a 20 grade.

-Dennis
bluesubie is offline   Reply With Quote
Old 10-23-2007, 09:43 AM   #8
leecea
Scooby Guru
 
Member#: 37359
Join Date: May 2003
Vehicle:
2003 WRX

Default

Thanks. The more I read NASIOC, the more confused I am about oil!

I ran M1 5w30 for ages and it seemed fine, then I read all the doom and destruction threads about that being way too thin if you push the car hard in the summer (though it was still within grade on my UOA).

I also switched jobs and now have a very much shorter commute, so my oil temps are not getting up there, which I believe will lead to fuel dilution issues.

So, my decision was switch to a cheaper and thicker oil, and change it frequently - less than 3K. Hence, dino 10w40.

In the winter, I'll run 5w30 again to help with cold startup issues.

Actually seems like a lot of fuss over nothing, since my car burns zero oil of any kinda at 50K miles and lots of autox runs.
leecea is offline   Reply With Quote
Old 10-23-2007, 09:54 AM   #9
bluesubie
Scooby Guru
 
Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
Vehicle:
04 FXT

Default

Quote:
Originally Posted by leecea View Post
I also switched jobs and now have a very much shorter commute, so my oil temps are not getting up there, which I believe will lead to fuel dilution issues.
Fuel dilution can be as tough (or tougher) on oil as very hard driving so changing often is a good idea. My daily trips are 5 miles each way, but I still run oil for 6-7k. Here's my last uoa .

A guy on subaruforester.org used to run GTX 10W40 in an FXT and it always sheared to a low 30 grade. There are lots of Viscosity Index Improvers in a 10W40. They're the first thing that's depleted in oil.

-Dennis

Last edited by bluesubie; 10-23-2007 at 10:03 AM.
bluesubie is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Oil Analysis - Castrol Syntec GC 0w-30 - 5000mi - 2005 Subaru WRX FD777 Service & Maintenance 4 03-20-2008 01:07 PM
Oil Analysis - Castrol Syntec GC 0w-30 - 4000mi - 2005 Subaru WRX FD777 Service & Maintenance 9 07-25-2007 10:40 AM
Used Oil Analysis - Castrol Syntec 10W40 - Subaru WRX STi alanlcit Service & Maintenance 19 07-24-2007 03:09 AM
Oil Analysis - Castrol Syntec GC 0w-30 - 4100mi - 2005 Subaru WRX FD777 Service & Maintenance 7 04-02-2007 04:01 PM
Used oil analysis FXT 6,144 miles German Castrol Syntec 0W30 bluesubie Service & Maintenance 4 11-19-2005 08:21 AM


All times are GMT -4. The time now is 10:29 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.