2004 STi questions

2016 · 11-18-2020, 10:59 PM

Hey all,

I recently bought a 2004 STi with 39k original miles on it. The car is mint. I am new to this model year so bear with me on a few questions:

1. What differential fluid do you recommend? The fluid hasn't been changed before. This might be a noob question, but, is there a front center and rear diff that requires a fluid change?

2. This might be a loaded question, but what oil brand and weight do you recommend? The owner used Mobil1 for the entire life of the car. But, I don't know which weight.

3. The spark plugs are original with 39k miles. Do they need to be changed or can I keep running them? They have 39k miles but are 16 years old. I was leaning toward replacing them.

4. Any other items that I might want to look into in terms of maintenance, etc?

Thanks in advance!

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Unabomber · 11-18-2020, 11:39 PM

1. Wrong forum and you did not read the sticky threads. https://forums.nasioc.com/forums/sho...d.php?t=995498
2. Wrong forum and you did not read the sticky threads. https://forums.nasioc.com/forums/sho...d.php?t=499177
3. Wrong forum and you did not read the sticky threads. https://forums.nasioc.com/forums/sho...d.php?t=518633
4. https://forums.nasioc.com/forums/sho....php?t=2740715

11-18-2020, 10:59 PM	#1
2016 Scooby Newbie Member#: 442591 Join Date: Mar 2016 Location: Nashville, TN Vehicle: 2016 WRX Limited WRB	2004 STi questions Hey all, I recently bought a 2004 STi with 39k original miles on it. The car is mint. I am new to this model year so bear with me on a few questions: 1. What differential fluid do you recommend? The fluid hasn't been changed before. This might be a noob question, but, is there a front center and rear diff that requires a fluid change? 2. This might be a loaded question, but what oil brand and weight do you recommend? The owner used Mobil1 for the entire life of the car. But, I don't know which weight. 3. The spark plugs are original with 39k miles. Do they need to be changed or can I keep running them? They have 39k miles but are 16 years old. I was leaning toward replacing them. 4. Any other items that I might want to look into in terms of maintenance, etc? Thanks in advance! * Registered users of the site do not see these ads.

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11-18-2020, 11:39 PM	#2
Unabomber 👏 Big Ron 👏 Moderator Member#: 18062 Join Date: Apr 2002 Chapter/Region: MAIC Location: I can save you a ton of cash Vehicle: on car parts so PM me b4 j00 buy	1. Wrong forum and you did not read the sticky threads. https://forums.nasioc.com/forums/sho...d.php?t=995498 2. Wrong forum and you did not read the sticky threads. https://forums.nasioc.com/forums/sho...d.php?t=499177 3. Wrong forum and you did not read the sticky threads. https://forums.nasioc.com/forums/sho...d.php?t=518633 4. https://forums.nasioc.com/forums/sho....php?t=2740715