How to: changing rear diff oil

**Rennes** · 08-04-2007, 01:38 PM

How to: changing rear diff oil
How to was created using a STi USDM 2004.

RECOMMENDED: GO take a 5 min ride with you car before doing this, so the oil will be a bit hot and will drain MUCH quicker.

NOTE: This should read "sealant" instead of "scellant."

Subaru recommends GL-5 oil. Motul is GL-5 approved.

Press down where the arrow points, and pull that clip towards you.

Remember these 2 holes

Place your oil pan under the read diff. Take your 30 mm wrench and wrench counter-clockwise to remove the plug.

Filthy! Dirty plug!

After you removed the plug, you will see some oil drip.

Take the 1/2 torq bar and unscrew the DRAIN plug. Just break the plug loose.

Turn the torq wrench towards you (as if it was a big screwdriver) and turn it counter-clock wise to remove the DRAIN plug.

Let the oil drip for a good 5 min. Ernest sayz: EWWWWWWWWWWWW! LOOK AT TEH OIL COLORRRRRRR!

You can inspect your DRAIN plug while the oil drains. It's actually a magnet that collects little metal shavings. Clean it up!

Clean both the hole up with a towel.

Put some thread sealant on the DRAIN plug. Not too too much.
Tip: Apply teflon in the opposite direction (counter clockwise) when ready to thread the plug. From aztlan-lt1

I torq'ed it to 45lbs and it seemed fine. Now FILL the rear diff with your new MOTUL oil.
Fill it till some oil starts coming out.
Put some thread scellant on the FILL plug and put the FILL plug back in.

You are DONE!

**Rennes** · 08-05-2007, 02:23 AM

reserved.

aznboi320 · 08-08-2007, 12:48 AM

I did this a month ago and I swear i will never do it again. The smell is horrible

whitestar · 08-14-2007, 02:09 PM

nice write up!

WRC~06~STi · 08-14-2007, 02:17 PM

awesome write up man. i am doing this soon with amsoil and this will help majorly~ thanks a lot

sti charles · 08-18-2007, 01:16 AM

Great write-up. Helped me out tonight with my change.

whitestar · 08-18-2007, 06:57 PM

where did you get that oil pump?

arkleseizure · 08-18-2007, 07:01 PM

Real easy change...except pumping the oil back in!

And it really does smell as bad as advertised. Blergh.

Edited to say thanks for the great writeup...I very much appreciate pictoral walkthroughs!

GoodTimes · 08-18-2007, 07:03 PM

how often should you do this?

aznboi320 · 08-18-2007, 07:18 PM

Quote:

Originally Posted by GoodTimes

how often should you do this?

every 30k

aznboi320 · 08-18-2007, 07:26 PM

Quote:

Originally Posted by whitestar

where did you get that oil pump?

i got mine from kragen

pics are from http://www.bescaredracing.com or wolfplayer i rehosted them so i won't steal their bandwidth

**WC LATHE WERKS** · 08-20-2007, 05:39 AM

just remember to remove the cap if you use a pre-opened bottle of fluid

i had to drain it out once after launching the cap into my diff housing. that was pretty scary/ stupid

sigma69pi · 08-20-2007, 06:17 AM

Did mine this weekend and it went like this DIY. Great resource! THANKS!!!!!!!!!!!!!!!!

whitestar · 08-20-2007, 07:51 AM

Doing mine coming weekend, thanks for all the info guys!

fourseasonsandles · 08-20-2007, 08:09 AM

I did this 2 weekend ago. It is pretty easy actually. I didnt have a pump to put the fluid back into the diff, so I just used a funnel and a long hose. My dad poured the diff fluid into the funnel and I stayed underneith the car to make sure it had enough in it. Worked pretty well!

Nice write up though!

08-04-2007, 01:38 PM	#1
Rennes Gold Member Car: 04 Subaru WRX STi Fav Mod: Fujitsubo!!!!!!!! Location: Québec Posts: 145 Join Date: Nov 2006 Trader Rating: (0)	How to: changing rear diff oil How to: changing rear diff oil How to was created using a STi USDM 2004. RECOMMENDED: GO take a 5 min ride with you car before doing this, so the oil will be a bit hot and will drain MUCH quicker. NOTE: This should read "sealant" instead of "scellant." Subaru recommends GL-5 oil. Motul is GL-5 approved. Press down where the arrow points, and pull that clip towards you. Remember these 2 holes Place your oil pan under the read diff. Take your 30 mm wrench and wrench counter-clockwise to remove the plug. Filthy! Dirty plug! After you removed the plug, you will see some oil drip. Take the 1/2 torq bar and unscrew the DRAIN plug. Just break the plug loose. Turn the torq wrench towards you (as if it was a big screwdriver) and turn it counter-clock wise to remove the DRAIN plug. Let the oil drip for a good 5 min. Ernest sayz: EWWWWWWWWWWWW! LOOK AT TEH OIL COLORRRRRRR! You can inspect your DRAIN plug while the oil drains. It's actually a magnet that collects little metal shavings. Clean it up! Clean both the hole up with a towel. Put some thread sealant on the DRAIN plug. Not too too much. Tip: Apply teflon in the opposite direction (counter clockwise) when ready to thread the plug. From aztlan-lt1 I torq'ed it to 45lbs and it seemed fine. Now FILL the rear diff with your new MOTUL oil. Fill it till some oil starts coming out. Put some thread scellant on the FILL plug and put the FILL plug back in. You are DONE! This ad is not endorsed by this member. Please register or login to hide this ad. Last edited by Rennes : 02-27-2008 at 09:22 AM.

08-05-2007, 02:23 AM	#2
Rennes Gold Member Car: 04 Subaru WRX STi Fav Mod: Fujitsubo!!!!!!!! Location: Québec Posts: 145 Join Date: Nov 2006 Trader Rating: (0)	Re: How to: changing rear diff oil reserved. Last edited by Rennes : 08-08-2007 at 02:18 AM.

08-08-2007, 12:48 AM	#3
aznboi320 Senior STI Driver Car: Steel Grey 06 STI Fav Mod: Stage 2 Location: Bay Area, CA Posts: 359 Join Date: Oct 2005 Trader Rating: (0)	Re: How to: changing rear diff oil I did this a month ago and I swear i will never do it again. The smell is horrible

08-14-2007, 02:09 PM	#4
whitestar Junior STI Driver Car: 06 Aspen white STI Location: Somerset, NJ Posts: 65 Join Date: Aug 2007 Trader Rating: (1)	Re: How to: changing rear diff oil nice write up!

08-14-2007, 02:17 PM	#5
WRC~06~STi Silver Member Car: 06STi K7GSX-R 600 Fav Mod: Stage 2 Catless!!!!! Location: Western NC Posts: 918 Join Date: Jul 2007 Trader Rating: (2)	Re: How to: changing rear diff oil awesome write up man. i am doing this soon with amsoil and this will help majorly~ thanks a lot

08-18-2007, 01:16 AM	#6
sti charles Junior STI Driver Car: 04 STI and 04 Srt-4 Location: Louisville KY Posts: 107 Join Date: Apr 2006 Trader Rating: (1)	Re: How to: changing rear diff oil Great write-up. Helped me out tonight with my change.

08-18-2007, 06:57 PM	#7
whitestar Junior STI Driver Car: 06 Aspen white STI Location: Somerset, NJ Posts: 65 Join Date: Aug 2007 Trader Rating: (1)	Re: How to: changing rear diff oil where did you get that oil pump?

08-18-2007, 07:01 PM	#8
arkleseizure The Next Petter Solberg Car: 00 S2000, 04 WRB STi Location: Richmond, VA Posts: 987 Join Date: Jun 2006 Trader Rating: (7)	Re: How to: changing rear diff oil Real easy change...except pumping the oil back in! And it really does smell as bad as advertised. Blergh. Edited to say thanks for the great writeup...I very much appreciate pictoral walkthroughs! Last edited by arkleseizure : 08-18-2007 at 07:08 PM.

08-18-2007, 07:03 PM	#9
GoodTimes Grassroots STI Racer Car: 07 Impreza WRX STI, Fav Mod: Track days!!! Location: Chino Ca Posts: 585 Join Date: Mar 2007 Trader Rating: (0)	Re: How to: changing rear diff oil how often should you do this?

08-20-2007, 05:39 AM	#12
WC LATHE WERKS Authorized Vendor Car: 04WRX /STi Swap Fav Mod: TiC AST Coilovers!!! Location: Tri-State, USA Posts: 1,223 Join Date: Nov 2005 Trader Rating: (86)	Re: How to: changing rear diff oil just remember to remove the cap if you use a pre-opened bottle of fluid i had to drain it out once after launching the cap into my diff housing. that was pretty scary/ stupid

08-20-2007, 06:17 AM	#13
sigma69pi Amateur STI Driver Posts: 12 Join Date: Apr 2005 Trader Rating: (0)	Re: How to: changing rear diff oil Did mine this weekend and it went like this DIY. Great resource! THANKS!!!!!!!!!!!!!!!!

08-20-2007, 07:51 AM	#14
whitestar Junior STI Driver Car: 06 Aspen white STI Location: Somerset, NJ Posts: 65 Join Date: Aug 2007 Trader Rating: (1)	Re: How to: changing rear diff oil Doing mine coming weekend, thanks for all the info guys!

08-20-2007, 08:09 AM	#15
fourseasonsandles Silver Member Car: 06 CGM Wingless Fav Mod: Street Tune! Location: Ra cha cha NY Posts: 2,894 Join Date: Sep 2005 Trader Rating: (0)	Re: How to: changing rear diff oil I did this 2 weekend ago. It is pretty easy actually. I didnt have a pump to put the fluid back into the diff, so I just used a funnel and a long hose. My dad poured the diff fluid into the funnel and I stayed underneith the car to make sure it had enough in it. Worked pretty well! Nice write up though! This ad is not endorsed by this member. Please register or login to hide this ad.