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Old 10-12-2012, 01:46 PM   #1
PrecisionX
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Default Why are so many of these engines replaced or rebuilt?

Looking at the private sale sector for WRXs or STis I can't help but notice this


Ex:

112,000 miles on chassis
44,000 miles on new motor


Or....

Ex:

87,000 miles, spun rod

I seem to see this so much, why are so many of these things blowing up? Needing rebuild? Makes me want to run far far away from any high mileage ownership of anything turbo Subaru.
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Old 10-12-2012, 03:10 PM   #2
Rudywrx04
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Because kiddies turn up the boost with out proper tune/modification and they use the wrong weight oil/do not check the oil.
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Old 10-12-2012, 03:16 PM   #3
Concillian
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The real root cause is this:
Subaru specifies 5W30 oil and most off the shelf 5W30 oils break down to 20Wt oil in 2000-2500 miles in the turbo engines. All the other stuff help, but this is the main issue.

Couple that main issue with an engine design that has narrow bearings that is the powerplant in a vehicle that attracts kids who rev the crap out of their engine when it's cold.... It's like hitting the spun bearing trifecta.

Oil service interval is listed much, much higher than what the used oil analyses have shown oils shearing down to much lower than 30wt. viscosity. This includes synthetics like Mobil 1, Royal Purple, etc... Only a few select xW30 oils made specifically to be shear resistant hold up for any length of time. Later turbo models reduced oil change intervals specifically for the turbo models to 3k due to spun bearing issues, but the real solution is to use a 40wt oil. Like 0W40 / 5W40 syn.

The good news is that when you have an oiling problem with bearings, wear is almost completely eliminated when you get it right, so past history is not necessarily a big deal.

For private owners of high mileage original engines, you want to ask what brand and viscosity oil they used and at what change intervals. Run away from someone who says whatever Mobil 1 was at Costco, especially if the car is modded or otherwise will indicate they abused it on 30wt oil at long oil change intervals.

PS, my 02 WRX is at 180k miles on the original engine and sees redline multiple times a week on a larger turbo at 20+ psi. Oiling and timing belt maintenance (replace the idlers with the timing belt) are the only major daily driver longevity concerns for the EJ205.

Last edited by Concillian; 10-12-2012 at 03:25 PM.
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Old 10-12-2012, 03:17 PM   #4
Uncle Scotty
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Quote:
Originally Posted by Rudywrx04 View Post
Because kiddies turn up the boost with out proper tune/modification and they use the wrong weight oil/do not check the oil.
^^^^^^^

and its the new beginners car....the new civic....of the kiddie kar world

and kiddies dont know **** and blow them up with such glee
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Old 10-12-2012, 03:19 PM   #5
todeswalzer
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Because Maine only has 91 octane and 93 octane protunes don't like that very much
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Old 10-12-2012, 03:20 PM   #6
Uncle Scotty
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Quote:
Originally Posted by Concillian View Post
Subaru specifies 5W30 oil
no-no-NO

it is recommended......for mpg ONLY....the owners manual and the factory service manual both show that OTHER oils can and SHOULD be used under sever driving conditions

and the kiddie boiz dont care nuffin about no oil in the motor...they just wannabe all k00 and **** and
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Old 10-12-2012, 03:21 PM   #7
Uncle Scotty
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Quote:
Originally Posted by todeswalzer View Post
Because Maine only has 91 octane and 93 octane protunes don't like that very much
'protunes' dont care what octane ya got....

idiots are the answer
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Old 10-12-2012, 03:22 PM   #8
Uncle Scotty
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and this thread is gonna be the KING idiotfest here in a bit

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Old 10-12-2012, 03:24 PM   #9
todeswalzer
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Tell that to my engine that happily spun a bearing while trying to get home from ~3 hours into Maine on 91 after 2+ years of auto crossed 300whp with a perfectly full pan of rotella t6
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Old 10-12-2012, 03:28 PM   #10
Uncle Scotty
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Quote:
Originally Posted by Uncle Scotty View Post
'protunes' dont care what octane ya got....

idiots are the answer
Quote:
Originally Posted by todeswalzer View Post
Tell that to my engine that happily spun a bearing while trying to get home from ~3 hours into Maine on 91 after 2+ years of auto crossed 300whp with a perfectly full pan of rotella t6


somebody blew their engine up doin something st00pid???


say it aint so


and 3 hours of 91 on a 93 tune shouldnt have been deadly.....look elsewhere for the real issue
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Old 10-12-2012, 03:28 PM   #11
07VTRex
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they blow up because people like to push them until the pop.

then someone else buy it and builds it bigger better faster, until it pops again

the cycle repeats.

the reason is people like going fast. motors dont like it as much as we do.
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Old 10-12-2012, 03:30 PM   #12
todeswalzer
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Quote:
Originally Posted by Uncle Scotty

somebody blew their engine up doin something st00pid???

say it aint so

and 3 hours of 91 on a 93 tune shouldnt have been deadly.....look elsewhere for the real issue
Its called detonation, maybe you've heard of it?

Up and down and up and down hills + mountains. Engine under load on octane lower than its designed for. Detonation. Crushed/spun bearing.

It happens.


The only 'dumb' thing I did was assume Maine had 93.
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