transmission and differential oil change for manual 2006 impreza

[joe]

Hello, i change my engine oil today at a valvoline instant oil change
center. I have a manual transmission and 46000 miles. I was told that
the transmission oil must be changed every 30k miles. i thought manual
cars would go a lot longer. They also said I have to change the
differential oil every 15k miles. Are this numbers correct? would it
be ok to change the differential and transmission oil at a valvoline
instant oil change or should I go to the subaru dealership for this?
Any one with high miles has experence with this?

 

[Bob Noble]

Yes, I never change mine in a manual. And almost nobody changes the diffs
either. 15k on the diff for an oil change is just nuts.
They'll go a long time unless the oil leaks out.

 

[S]

Hi Joe!

Hello, i change my engine oil today at a valvoline instant oil change
center. I have a manual transmission and 46000 miles. I was told that
the transmission oil must be changed every 30k miles. i thought manual
cars would go a lot longer. They also said I have to change the
differential oil every 15k miles. Are this numbers correct? would it
be ok to change the differential and transmission oil at a valvoline
instant oil change or should I go to the subaru dealership for this?
Any one with high miles has experence with this?

What Bob sez.

While it never hurts to install fresh fluid, it isn't really
necessary. I'd suggest waiting until you have to drain the tranny
fluid _anyway_ for a clutch job or what ever, and then put synthetic
fluid in both.

I put Redline synthetic in the '02 WRX I used to have, and was real
happy with the results. Sure, it costs more, but the additional
expense is insignificant compared to the hassle of doing the job.

Absolutely no reason why any competent wrench couldn't do this for
you, or why you couldn't DIY for that matter,. 'Bout the only
troublesome part of the job is getting the fill plug for the rear diff
out; Subaru uses a killer-diller epoxy thread sealant here. Trick is
to gently heat the area around the plug with a propane torch until you
can easily gouge the threadlock compound with a sharp object. (It
softens with heat, probably about 100-150C) The plug will then come
out with only modest effort.

ByeBye! S.

Steve Jernigan KG0MB
Laboratory Manager
Microelectronics Research
University of Colorado
(719) 262-3101

 

[joe]

Thanks for the responses. Looks like Redline synthetic is the stuff to
use. I got 46k miles in my car and I got it yesterday. It was off
somebody's lease. I will wait for my next oil change. I just got the
service manual from ebay before asking anymore silly questions.

 

[StephenH]

Hello, i change my engine oil today at a valvoline instant oil change
center.  I have a manual transmission and 46000 miles. I was told that
the transmission oil must be changed every 30k miles. i thought manual
cars would go a lot longer. They also said I have to change the
differential oil every 15k miles. Are this numbers correct? would it
be ok to change the differential and transmission oil at a valvoline
instant oil change or should I go to the subaru dealership for this?
Any one with high miles has experence with this?

All fluids get changed at our shop every 30K; Auto trans gets a drain
and fill from the pan, no filter change. Never do any diff's any
earlier.
As for the drain plugs, a big 1/2 inch long ratchet has never let me
down. Getting the fluid our is easy, getting new fluid in can be hard.
Turbo's have a smaller fill tube, more lible to burping; and why the
fill tubes have to be so far down baffles me.
About .75 qt for the rear (sti's have special fluid) 1.25 for the ft
diff on a auto, about 3 qts on a standard manual.