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Old 09-08-2019, 01:12 AM   #1
LG9892
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Default Underrated Maintenance (STI)

Which part of maintenance that people mostly overlooked?Tell me your thoughts
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Old 09-08-2019, 02:04 PM   #2
CaptainSlowbaru
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From my dealer experience, most WRX/ STi owners that "do their own maintenance" are likely doing oil changes and nothing more. (That's not meant as a blanket statement- I'm sure most people on this forum likely do full maintenances. This is strictly from my dealer experience.)

So to answer your question, my opinion is that 30k, 60k, 90k etc. are the most overlooked maintenance items on WRX or STi.

30k service gets an oil change, air filter, brake flush, PCV valve (depends on where you go).
60k is the big one; it gets everything in the 30k, plus spark plugs, and- in most cases- differential services.
90k is like a 30k.
105k is the timing belt (except for the FA20T)
120k is like the 60k; some places like to do extras at this interval, like coolant and trans service (auto or CVT)

To sum up my thoughts on this: DIY guys that only do oil changes likely never get that other stuff done.
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Old 09-08-2019, 02:43 PM   #3
Big-E
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Transmission gear oil
Rear differential gear oil
In-tank fuel-filter
Power-steering fluid
Timing-belt and related items
Vacuum / emissions hoses
Accessory belts
Brake fluid / clutch fluid
Brake pads

People don't know / don't care / cost is too high

Last edited by Big-E; 09-08-2019 at 02:49 PM.
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Old 04-24-2023, 10:12 AM   #4
maleiky98
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How often should these be done? Some people say change spark plugs every 20k or 15k miles and I feel that's excessive. I can't find a realistic maintenance guide anywhere!! And I won't follow Subarus because they say wait too long between oil changes so idk what's accurate in that book
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Old 04-24-2023, 10:41 AM   #5
19std
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What happens if you dont change your steering fluid? Does it degrade into gummy? I have never owned a non electric power steering for long enough to have seen any issues.

PCV valve is a good one, i can see some interesting stuff happening there.
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Old 04-24-2023, 07:29 PM   #6
CaptainSlowbaru
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Quote:
Originally Posted by maleiky98 View Post
How often should these be done? Some people say change spark plugs every 20k or 15k miles and I feel that's excessive. I can't find a realistic maintenance guide anywhere!! And I won't follow Subarus because they say wait too long between oil changes so idk what's accurate in that book
Plugs are every 60K miles. If any shop tells you 15-20K, don't go there- they're scamming. Synthetic oil gets changed every 6K miles, conventional oil every 3,750 miles. Subaru's maintenance schedule is perfectly fine for daily driven, stock (or mostly stock) vehicles. There is a regular schedule and a severe schedule. All of the driving done around here is considered "severe", and that's what we always go off of. If your car is heavily modded, or you race it regularly, perhaps take Subaru's maintenance and halve it.
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Old 05-19-2023, 07:48 AM   #7
wooshwoosh
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Here's a kicker: Galvanic corrosion interactions between aluminium (block, heads) and their steel fasteners, mls headgaskets, coolant pipe fittings.

Also ridiculous factory torque specs for water pump bolts and a variety of m6/m8 threaded aluminium holes (eg small idler bearing beside hydraulic tensioner).
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Old 05-19-2023, 07:49 AM   #8
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