Welcome to the North American Subaru Impreza Owners Club Thursday November 27, 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 > Normally Aspirated Powertrain

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 01-21-2013, 11:00 PM   #1
travisamorgan
Scooby Newbie
 
Member#: 327502
Join Date: Jul 2012
Location: Lima,OH
Vehicle:
2007 Impreza 2.5i
Blue

Question Switch to synthetic in 07 2.5i with 104,000 miles?

should i switch to synthetic oil in my 07 2.5i? i just did the headgaskets and timing belt. it has 103,000 miles on it. i searhed and read that synthetic does run cooler and in theory increases gas mileage (but thats debatable) and increases power since the engine can run easier (once again in theory). i have always ran pennzoil high mileage and changed the oil every 3000 miles. i also read that if you change to synthetic with high mileage on your car it will leak from the seals since th dino oil has made the holes in the seals bigger on the molecular level or whatever. i was thinking about running pennzoil ultra full synthetic 5w30. i have read tho to run mobil 1 10w40 but i like pennzoil. always have ran it with no issues at all.
* Registered users of the site do not see these ads.
travisamorgan is offline   Reply With Quote
Old 01-21-2013, 11:49 PM   #2
alt14
Scooby Specialist
 
Member#: 271928
Join Date: Jan 2011
Chapter/Region: Tri-State
Location: Gettysburg PA
Vehicle:
2014 WRX Limited
Crystal Black Silica

Default

I've been running valvoline synpower 5w-30 since I've owned my 07 (09 with 50,000 miles on it) and now have 88,000 on it, I try to change it every 3,000-4,000 miles. The only leaking that I know of is my spark plug tube seals but I'm pretty sure that it's not an uncommon problem with ej engines.

No notice in power of course and my gas is about average for the five speed though I've managed 32mpg driving really easy.

I have been doing their 300,000 mile guarantee sense I used it.. not that they would actually cover it if something were to happen haha, just nice to fill it out and see all the times you've done it and how many miles you've gone since.

Last edited by alt14; 01-22-2013 at 05:59 PM.
alt14 is offline   Reply With Quote
Old 01-22-2013, 12:45 AM   #3
Dr. Octawakaoctapus
Scooby Newbie
 
Member#: 262003
Join Date: Oct 2010
Chapter/Region: NWIC
Location: MLT
Vehicle:
1994 Legacy
teal

Default

Running the synthetic really won't cause anymore leaks and the synthetic will help keep your engine internals a little better protected. I've used the Pennzoil Ultra on many vehicles and all seems great. It may help your engine go a little longer but it may not. It will for sure though not hurt your engine and/or seals.
Dr. Octawakaoctapus is offline   Reply With Quote
Old 01-23-2013, 09:51 PM   #4
subi400
Scooby Specialist
 
Member#: 216984
Join Date: Jul 2009
Chapter/Region: NWIC
Location: Hayden, ID
Vehicle:
1996 Impreza outback
Green

Default

If you want to switch to a good synthetic try M1 0w40 which does not have the new GF-5 rating on the label on the back or you could give the Shell Rotella T-6 5w40 a try since it is a little cheaper then a lot of the full synthetic 5w30's.

Or, you could stick to a high mileage oil and run the valvoline Maxlife high mileage 5w30 or the M1 5w30 high mileage and keep doing your 3k OCI's.
If your car is a daily driver I would suggest the second option rather than the first one.
subi400 is offline   Reply With Quote
Old 01-24-2013, 11:10 PM   #5
POC
Scooby Newbie
 
Member#: 344560
Join Date: Jan 2013
Location: Indiana
Vehicle:
2007 Impreza
Silver

Default

What is the difference in "regular" oil, synthetic and "high mileage"?
POC is offline   Reply With Quote
Old 01-24-2013, 11:54 PM   #6
subi400
Scooby Specialist
 
Member#: 216984
Join Date: Jul 2009
Chapter/Region: NWIC
Location: Hayden, ID
Vehicle:
1996 Impreza outback
Green

Default

Quote:
Originally Posted by POC View Post
What is the difference in "regular" oil, synthetic and "high mileage"?
Regular oil as in dino or none synthetic, just a basic oil. Synthetic meaning better base stocks and has additives to help with cleaning, stability and longevity. A high mileage oil has seal conditioners in it along with a bit more additive level.
subi400 is offline   Reply With Quote
Old 01-24-2013, 11:59 PM   #7
chazly413
Scooby Specialist
 
Member#: 151079
Join Date: Jun 2007
Chapter/Region: MAIC
Location: College Park, MD
Vehicle:
2005 2.5RS RBP
motec system exhaust-RIP

Default

You guys can definitely run higher than 3000 to 4000 mile OCIs, unless you're driving a ton of city. I try to stick to around a 4500 mile/4 month OCI mainly because I do a lot of around town driving. If I was commuting to work, I would definitely bump that to 6000 or so.

I just run the ol' Pennzoil yellow bottle or Quaker State with a Purolator PureONE, whichever is cheaper.
chazly413 is offline   Reply With Quote
Old 01-25-2013, 11:58 AM   #8
Hangry
Scooby Newbie
 
Member#: 342172
Join Date: Dec 2012
Chapter/Region: RMIC
Location: Logan, UT
Vehicle:
03 WRX Wagon
sedona red pearl

Default

I switched to full synthetic in my 07 2.5i with ~140k and it constantly smelled hot like oil on the manifold smell. I think it was just leaking through the head gasket. Switched back to dino/synth blend and the problem went away immediately. From what I could find this is just because the synthetic molecules are smaller. IDK. Anyway, since you say you replaced the head gasket, that shouldn't be an issue. I did feel like the car ran smoother on the synth oil. Also did get better mileage. If I did new gaskets I would consider full synthetic again. I used mobile1 extended performance, and normally use Castrol GTX high mileage.
Hangry is offline   Reply With Quote
Old 01-25-2013, 04:36 PM   #9
GrundleJuice
NASIOC Supporter
 
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

Default

Quote:
Originally Posted by subi400 View Post
If you want to switch to a good synthetic try M1 0w40 which does not have the new GF-5 rating on the label on the back
M1 is far from a good synthetic. It's not even a true fully synthetic base stock. It also shears down rapidly in the n/a EJ engines.
GrundleJuice is offline   Reply With Quote
Old 01-26-2013, 03:20 AM   #10
subi400
Scooby Specialist
 
Member#: 216984
Join Date: Jul 2009
Chapter/Region: NWIC
Location: Hayden, ID
Vehicle:
1996 Impreza outback
Green

Default

Quote:
Originally Posted by RaceFaceXC View Post
M1 is far from a good synthetic. It's not even a true fully synthetic base stock. It also shears down rapidly in the n/a EJ engines.
Not the M1 0w40 and their 10w30 and 10w40 high mileage. The M1 TDT 5w40 is a very robust oil. Maybe you need to reserach these few oils from M1 to see how different they are from the other ones.
subi400 is offline   Reply With Quote
Old 01-26-2013, 03:30 AM   #11
mod maniac
NASIOC Supporter
 
Member#: 300551
Join Date: Nov 2011
Chapter/Region: SCIC
Location: mariposa ca.
Vehicle:
2&4 fxt & fxt sti
Fullers Garage

Default

I have seen synthetic oil cause leaks on engines that had no leaks and when we changed back to non-synthetic the leaks went away. So try it and if it leaks change back.
mod maniac is offline   Reply With Quote
Old 01-26-2013, 04:24 AM   #12
Steve2.5i
Scooby Specialist
 
Member#: 293006
Join Date: Aug 2011
Chapter/Region: SCIC
Location: San Diego
Vehicle:
2015 Subaru WRX
WR Blue

Default

Quote:
Originally Posted by RaceFaceXC View Post

M1 is far from a good synthetic. It's not even a true fully synthetic base stock. It also shears down rapidly in the n/a EJ engines.
Out of curiosity, what is ur preference when it comes to oil? Syn/non syn/brand/rating. After tearing through threads n threads I keep running through biased opinions or fan boys.
Steve2.5i is offline   Reply With Quote
Old 01-26-2013, 07:28 AM   #13
GrundleJuice
NASIOC Supporter
 
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

Default

Quote:
Originally Posted by Steve2.5i View Post

Out of curiosity, what is ur preference when it comes to oil? Syn/non syn/brand/rating. After tearing through threads n threads I keep running through biased opinions or fan boys.
I can only speak to what I have tried and I'm sure there are other good oils besides the one I use. With that said the best uoa results from daily driving AND track use have come from AmsOil 5w30 & 5w40. I am able to run the AmsOil to 8k+ miles between changes with great uoa results. My consumption went from about 1+ qt every 2k miles with M1 to about a half qt every 8k miles with AmsOil after the 2nd oil change with it. It's probably prudent to mention the filter I use is also a synthetic media. Castrol 5w30 also had good results under daily driving conditions.
GrundleJuice is offline   Reply With Quote
Old 01-26-2013, 11:15 AM   #14
Eyedoc Orlando
Scooby Newbie
 
Member#: 146216
Join Date: Apr 2007
Chapter/Region: South East
Location: Birmingham, AL
Vehicle:
2007 Impreza 2.5i SE
Newport Blue Metallic

Default

Eyedoc Orlando is offline   Reply With Quote
Old 01-26-2013, 01:22 PM   #15
Hangry
Scooby Newbie
 
Member#: 342172
Join Date: Dec 2012
Chapter/Region: RMIC
Location: Logan, UT
Vehicle:
03 WRX Wagon
sedona red pearl

Default

Quote:
Originally Posted by mod maniac View Post
I have seen synthetic oil cause leaks on engines that had no leaks and when we changed back to non-synthetic the leaks went away. So try it and if it leaks change back.
Like I said, this was my experience. No trouble before the switch to full synth, then it leaked, then leaks stopped when I switched back. So I second this. Try it, and if you get leaks switch back.
Hangry is offline   Reply With Quote
Old 01-26-2013, 04:02 PM   #16
Steve2.5i
Scooby Specialist
 
Member#: 293006
Join Date: Aug 2011
Chapter/Region: SCIC
Location: San Diego
Vehicle:
2015 Subaru WRX
WR Blue

Default

Quote:
Originally Posted by RaceFaceXC View Post

I can only speak to what I have tried and I'm sure there are other good oils besides the one I use. With that said the best uoa results from daily driving AND track use have come from AmsOil 5w30 & 5w40. I am able to run the AmsOil to 8k+ miles between changes with great uoa results. My consumption went from about 1+ qt every 2k miles with M1 to about a half qt every 8k miles with AmsOil after the 2nd oil change with it. It's probably prudent to mention the filter I use is also a synthetic media. Castrol 5w30 also had good results under daily driving conditions.
Thanks for your input, much appreciated.
Steve2.5i is offline   Reply With Quote
Old 01-26-2013, 08:09 PM   #17
gettle70
Scooby Newbie
 
Member#: 312825
Join Date: Mar 2012
Chapter/Region: NESIC
Location: Camp Hill PA
Vehicle:
2011 Impreza 2.5i
blue

Default

i switched on my 11 from the first oil change its nice the manual says to change the oil every 7,500 miles.
gettle70 is offline   Reply With Quote
Old 01-28-2013, 09:21 AM   #18
bluesubie
Scooby Guru
 
Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
Vehicle:
04 FXT

Default

Quote:
Originally Posted by travisamorgan View Post
should i switch to synthetic oil in my 07 2.5i? i just did the headgaskets and timing belt. it has 103,000 miles on it. i searhed and read that synthetic does run cooler and in theory increases gas mileage (but thats debatable) and increases power since the engine can run easier (once again in theory). i have always ran pennzoil high mileage and changed the oil every 3000 miles. i also read that if you change to synthetic with high mileage on your car it will leak from the seals since th dino oil has made the holes in the seals bigger on the molecular level or whatever. i was thinking about running pennzoil ultra full synthetic 5w30. i have read tho to run mobil 1 10w40 but i like pennzoil. always have ran it with no issues at all.
The conventional Pennzoil High Mileage that you're using can likely go 7,500 miles on an interval in your application. I run the same oil in a 2000 RS. I would only stick with it if you have leaks, which I do have a bit of weeping, but regular Pennzoil conventional in the yellow bottle will likely work fine.There's also no benefit in switching to a 40 weight oil in your application.

-Dennis
bluesubie is offline   Reply With Quote
Old 01-28-2013, 09:29 AM   #19
bluesubie
Scooby Guru
 
Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
Vehicle:
04 FXT

Default

Quote:
Originally Posted by RaceFaceXC View Post

I can only speak to what I have tried and I'm sure there are other good oils besides the one I use. With that said the best uoa results from daily driving AND track use have come from AmsOil 5w30 & 5w40. I am able to run the AmsOil to 8k+ miles between changes with great uoa results. My consumption went from about 1+ qt every 2k miles with M1 to about a half qt every 8k miles with AmsOil after the 2nd oil change with it. It's probably prudent to mention the filter I use is also a synthetic media. Castrol 5w30 also had good results under daily driving conditions.
Any Energy/Resource Conserving oil will shear in some applications and there isn't anything special about Castrol 5W-30. Please post your uoa's in the Service & Maintenance forum. And did you compare Mobil1 5W-40 to Amsoil 5W-40 in the same driving conditions? Keep in mind we're talking about an Impreza 2.5i here and they can run on any oil.

-Dennis
bluesubie is offline   Reply With Quote
Old 01-28-2013, 09:55 AM   #20
GrundleJuice
NASIOC Supporter
 
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

Default

Quote:
Originally Posted by bluesubie View Post

Any Energy/Resource Conserving oil will shear in some applications and there isn't anything special about Castrol 5W-30. Please post your uoa's in the Service & Maintenance forum. And did you compare Mobil1 5W-40 to Amsoil 5W-40 in the same driving conditions? Keep in mind we're talking about an Impreza 2.5i here and they can run on any oil.

-Dennis
I never said there was anything special about any oil. I do know that the M1 base stock oil is not fully synthetic. The Castrol syntec maintained viscosity far better than the m1. while it's not possible to run both oils at the same time, the driving conditions were daily driving summer time in FL. The only difference is that the Castrol was run for more miles, consumed less and had better results. I understand that an oil with htls properties is going to have some compromises but it's an engine/oil relationship thing. M1 5w30 in a 04 BMW 330 had great uoa results, little consumption. I'm not trying to knock M1 overall.

Impreza 2.5i could run on vegetable oil but it doesn't mean it's good for it.

I have posted some of my uoa previously.
GrundleJuice is offline   Reply With Quote
Old 01-28-2013, 02:10 PM   #21
bluesubie
Scooby Guru
 
Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
Vehicle:
04 FXT

Default

Quote:
Originally Posted by RaceFaceXC View Post

I never said there was anything special about any oil. I do know that the M1 base stock oil is not fully synthetic. The Castrol syntec maintained viscosity far better than the m1. while it's not possible to run both oils at the same time, the driving conditions were daily driving summer time in FL. The only difference is that the Castrol was run for more miles, consumed less and had better results. I understand that an oil with htls properties is going to have some compromises but it's an engine/oil relationship thing. M1 5w30 in a 04 BMW 330 had great uoa results, little consumption. I'm not trying to knock M1 overall.

Impreza 2.5i could run on vegetable oil but it doesn't mean it's good for it.

I have posted some of my uoa previously.
Mobil1 uses a variety of base stocks and they even blend different base stocks together in order to achieve the desired performance result (like most oil companies). They use a Group III proprietary base stock called Visom, as well as Group IV Polyalphaolefin's and Group V alkylated napthlene's. Shell, Valvoline, and Castrol also use primarily Group III base stocks.

In the end, base stock doesn't matter. It all comes down to how the oil performs and the certifications that it meets. Just look at all of the good uoa's on Rotella, a Group III oil and the number of European approvals that M1 0W-40 has. And hopefully you were referring to Mobil1 5W-30 ESP since that is the only M1 30 weight that meets BMW specs.

Here's a uoa on an 8,000 mile run of Group II Mobil conventional in a 2.5i Outback:
http://www.bobistheoilguy.com/forums...Number=2375274

-Dennis

Last edited by bluesubie; 01-28-2013 at 02:25 PM.
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


All times are GMT -4. The time now is 03:04 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.