About my 2004 Subaru WRX STI

Asked by Jun 24, 2017 at 09:32 PM about the 2004 Subaru Impreza WRX STI Turbo AWD

Question type: General

I have a 2004 Subaru WRX STI and this is a 2 part question. It has 38k miles
on it and i was wondering do you really need 93 octane will 91 be enough if
you dont have 93 in your area, and next question is when im driving it can i
have fun with it? Like give it gas and have fun with it once in a while without
hurting the car. And 1 more question SORRY! When im backing up into my
garage when i brake there is a squealing noise is that normal?

4 Answers


The car is made to be driven, so have fun, but be careful, watch the speed limits. You should use 93 for max. performance and MPG, 91 is fine. Brake noise can be normal if it's just some rust on the rotor and the pad squeaking. If it's loud and annoying, have a mechanic inspect the brakes.

1 people found this helpful.

The difference between 93 and 91 octane gasoline is minimal. You should be fine with the 91 octane. With today's computer controlled engines slight differences in fuel octane, altitude, temperature, etc. are all compensated for by the computer. I definitely would not run regular or mid grade gasoline in it! That would be too low of an octane even for the computer to accommodate! With a higher performance vehicle it's good to give it a good run every now and then. Let it "stretch it's legs" so to speak. Just be responsible and safe! With a turbo oil changes are very important! Be sure to do them at the time or mileage intervals as specified by Subaru. As for the brakes. You have very low mileage on this vehicle. As Tom said the rotors may have a little rust on them. I'd suggest having the brakes inspected. They may be original to the vehicle. Doesn't sound like anything serious but have them looked at for peace of mind. HTH. -Jim


If you can get 93 octane try it and compare the performance to 91 octane. You may get more boost with 93.

1 people found this helpful.

Wow...finally three great responses w/o unnecessary nonsense! I'll add that it would be very rare indeed to have 13 yr old rear rotors that DON'T squeal! The older 2.0T is sturdier than the subsequent 2.5T, so take care of it with clean higher vis synth to protect the turbo bearings from overheating the oil and burning them. I, too, wouldn't worry about 91 vs 93 oct. Just don't use 89.

1 people found this helpful.

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