Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 10-06-2009, 05:16 PM   #1
crazy06
Scooby Newbie
 
Member#: 208220
Join Date: Apr 2009
Location: Brisbane Australia
Vehicle:
2006 STi

Default What engine oil to use in high HP engines

Just wanting to know what some of you guys are using in your built engines
During run in & after run in.
Are you using
Mineral
Fully synthetic
Semi synthetic
Ive been told never use fully sythetic in any Subaru engine
* Registered users of the site do not see these ads.

Last edited by crazy06; 10-06-2009 at 10:36 PM.
crazy06 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 10-06-2009, 05:31 PM   #2
MobbDeep222
Scooby Newbie
 
Member#: 98199
Join Date: Oct 2005
Chapter/Region: NESIC
Location: Worcester County, MA
Vehicle:
2007 Impreza WRX STi
CGM Cosworth GT4094r

Default

In the manual to my cosworth motor, it says to use Mobil 1 Synthetic 15w-50. I'd trust their advice.
MobbDeep222 is offline   Reply With Quote
Old 10-06-2009, 06:23 PM   #3
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Most people use synthetic, the weight depends on your bearing clearances, weather, and driving style.
the suicidal eggroll is offline   Reply With Quote
Old 10-06-2009, 07:37 PM   #4
jays05
Scooby Specialist
 
Member#: 78165
Join Date: Dec 2004
Chapter/Region: South East
Location: SC
Vehicle:
05 STI 35r + e85

Default

I always ran Rotella 15w40. Tried rotella synthetic 5w40 when it was really cold out.
jays05 is offline   Reply With Quote
Old 10-06-2009, 07:44 PM   #5
bugeyesubie
Scooby Specialist
 
Member#: 179783
Join Date: May 2008
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX
Silver STi swap 380wph!!

Default

Yeah ron at Raw 1 recommended Rottella 15w40 which comes in mineral, blend and full syn. FYI this is diesel engine oil with special detergents for the diesel soot... maybe ron recommends this because of all the blow by we have, just a thought.
bugeyesubie is offline   Reply With Quote
Old 10-06-2009, 08:30 PM   #6
wrxwhat
Scooby Specialist
 
Member#: 87653
Join Date: May 2005
Chapter/Region: South East
Location: Long Island NY
Vehicle:
97 Supra / 17 GTR
16 Z06 / 07 STI / 05 Evo

Default

I use whatever I can find that is cheap. 10w40
wrxwhat is offline   Reply With Quote
Old 10-06-2009, 09:10 PM   #7
john 1badSTI
Scooby Specialist
 
Member#: 77470
Join Date: Dec 2004
Chapter/Region: MWSOC
Location: grove city ohio
Vehicle:
04 sti 10.41@141
on e85@ 30psi--spinning

Default

I have and always will use amsoil (after breakin) on all my high hp applications.Used it for years in my 7 sec. suzuki topgas bike and now use it in my built sti and all my clients motor builds and swear by it.
john 1badSTI is offline   Reply With Quote
Old 10-06-2009, 09:33 PM   #8
reddevil
Scooby Guru
 
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default

$1.99 20w50 currently.
reddevil is offline   Reply With Quote
Old 10-06-2009, 11:00 PM   #9
AWDWRXLOVER
Scooby Specialist
 
Member#: 50267
Join Date: Dec 2003
Chapter/Region: SWIC
Vehicle:
02 built hybrid
sr55/meth/sick speed

Default

Quote:
Originally Posted by wrxwhat View Post
I use whatever I can find that is cheap. 10w40
$14 jugs ftw
AWDWRXLOVER is offline   Reply With Quote
Old 10-07-2009, 01:39 AM   #10
RYNOMOTO
Scooby Newbie
 
Member#: 197147
Join Date: Dec 2008
Chapter/Region: TXIC
Location: Tyler
Vehicle:
2004 Subaru Forester
Java Black Pearl

Default

THE ONLY OILS YOU USE HAVE TO BE SAE-SL RATED....

If not, foghettaboutit....


Cheapest SAE-SL oils:

AUTOZONE brand orange bottle 10w40
PEAK brand 10w40
Chevron DELO 400 (diesel oil in gallon jugs only usually-- (NOT THE LOW EMISSION VERSION labeled DELO 400 LE)
Rotella T IF YOU FIND IT IN the SAE-SL rated version of the oil.... do not use the SM version....


Expensive but good oils:

Amsoil
Royal Purple
Joe Gibbs Racing Mineral and Synthetics (more ZDDP than any other oil)
Rotella T 5w40 SAE- SL rated only (not all of it that you find is SAE-SL, some is SM)





I don't care for blended oils, and the above oils are what I recommend usually...

I also don't recommend any oils lighter grade than 10w40 for built engines... which usually run more clearance than stock engines, therefore, they require a thicker viscosity oil....


The JOE GIBBS RACING oils are absolutely the best oils I have ever seen or used in built engines....

They are the nastiest smelling and stickiest-slickest oils, whether using the synthetic or mineral oils...


I use the Rotella 5w40 FULL SYNTHETIC in my stock engine with 157,000 miles on it, and it works great.....


again, it comes back to clearances and ambient air operating temperature along with the average oil temperature operating ranges
RYNOMOTO is offline   Reply With Quote
Old 10-07-2009, 10:22 AM   #11
EuroScuby
Scooby Newbie
 
Member#: 146056
Join Date: Apr 2007
Location: Germany
Vehicle:
2004 Subaru WRX STI
Blue

Default

Using RP 10w40 with no issues.
EuroScuby is offline   Reply With Quote
Old 10-07-2009, 10:35 AM   #12
zeenon53
Scooby Newbie
 
Member#: 183674
Join Date: Jul 2008
Location: OBX, NC
Vehicle:
2009 BMW 335i
LeMans Blue

Default

Rotella T 15w40 seems to be the best oil for me.
zeenon53 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
What Grade engine Oil to use Carl Wrx Newbies & FAQs 45 07-22-2008 12:25 AM
What weight oil to use in 97-98 2.5liter? 2slofouru Service & Maintenance 3 11-22-2005 11:37 AM
What type of oil to use on high mileage car? txl146 Service & Maintenance 5 02-04-2005 11:01 AM
What oil to use in tranny and diff (Redline)? WRBLUEWAGON Transmission (AT/MT) & Driveline 1 06-20-2002 10:58 AM
What brand of oil to use in RS? Vigorous Newbies & FAQs 3 12-08-2001 04:03 AM

All times are GMT -4. The time now is 06:11 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.