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Old 05-15-2012, 12:09 PM   #1
carrathanatos
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marine blue pearl

Default 2012 break-in period... which oil?

So, I did some looking around in the forum about whether I should be using conventional oil to break in my engine. My boyfriend (who has a rebuilt mustang engine) and his friend (who has an older subi) both insist I should put conventional oil in for at least 500 miles while I break in the engine.

This is what I found here:

http://forums.nasioc.com/forums/showthread.php?t=55512 <-- outdated, turns into discussion on breaking in girlfriends. Does address the rebuilt engine bit though.

http://forums.nasioc.com/forums/show....php?t=2310519 <-- doesn't really touch on the oil bit

http://forums.nasioc.com/forums/show....php?t=1579077 <-- only about changing oil, not about the type

So I thought I'd ask again.

Should I use conventional oil for a bit? I have a 2012 Impreza Sport Premium 5-speed, and it has roughly 850 miles on it right now. I'll keep looking, but if you guys have any input that'd be awesome. :3
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Old 05-15-2012, 01:42 PM   #2
flyboy1100
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DGM

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use what the factory put in. this car is supposed to only use synthetic
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Old 05-15-2012, 02:09 PM   #3
Commander Keen
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^ +1

Read the manual about the break-in period and drive accordingly.
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Old 05-15-2012, 02:12 PM   #4
Angelus911
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http://www.cars101.com/subaru/maintenance3.html

And there's no way you should put in conventional oil into your '12. It only takes 0-20w synthetic
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Old 05-15-2012, 02:31 PM   #5
gfxguy
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From this article: http://www.popularmechanics.com/cars...k-in-a-new-car

Quote:
Conventional wisdom says that a new engine should be broken in on conventional mineral oil, regardless of your intentions to use a synthetic for the long haul. The conventionally wise say that synthetic oil is too slippery and wonít let the microscopic high points properly lap themselves in, delaying the break-in process. I say rubbish. Many modern cars, notably such high-performance marques as Porsche, Ferrari and Corvette, are factory-​filled with synthetics. You can bet that somebody has determined that the break-in process will proceed normally with synthetic in the sump of these ultra-high-performance engines. And that goes for your Toyota or Jeep as well.

Nonetheless, I do prefer to use a mineral oil for break-in. Itís $3 a quart versus $7, so I donít mind changing it after 20 miles and again at 1000.

I would not, however, change the factory-fill synthetic back to mineral for break-in. Those vehicles typically have carefully assembled engines with instructions to do the first oil change at the regular interval, which could be up to 10,000 miles. In those cases, I simply change the oil early, before 1000 miles, just to be safe.
(emphasis added)

Short answer: use synthetic 0w-20 only.
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Old 05-15-2012, 03:18 PM   #6
Ladeef
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the engine is already "broken in" on a bench test anyway, like most modern engines just adhere to the owners manual.
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Old 05-15-2012, 03:55 PM   #7
carrathanatos
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Thanks! You guys are awesome!
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Old 05-15-2012, 07:49 PM   #8
2012ruimpreza
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^agree with everyone above
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Old 05-15-2012, 10:42 PM   #9
jr0bb5
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Not to change the subject much, but how many of you are going to wait until the recommended 7500 miles for your first oil change? I'm reading a lot of people are doing their first change at around 3000 mi. I personally plan to do my first oil change @ 3500 mi, then the second @ 7500 mi and then every 5000 mi. I do a lot of short trip driving on a variety of roads including dirt roads. My car also spends a good amount of time idling so I'm not sure if I'm comfortable going 7500 miles between oil changes.

Last edited by jr0bb5; 05-15-2012 at 10:51 PM.
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Old 05-15-2012, 10:47 PM   #10
flyboy1100
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with a quality synthetic you should be fine. I am going to run Amsoil with changes every 15-20k, haven't decided yet. I do mostly all highway driving.
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Old 05-16-2012, 07:36 PM   #11
subiTWO
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Quote:
Originally Posted by Suby Noobie View Post
Not to change the subject much, but how many of you are going to wait until the recommended 7500 miles for your first oil change? I'm reading a lot of people are doing their first change at around 3000 mi. I personally plan to do my first oil change @ 3500 mi, then the second @ 7500 mi and then every 5000 mi. I do a lot of short trip driving on a variety of roads including dirt roads. My car also spends a good amount of time idling so I'm not sure if I'm comfortable going 7500 miles between oil changes.

I"m doing my first 4 at 3,800 intervals. Brand new engine, and relatively recent oil formulation. Much cheaper and lower blood pressure than a seized engine. After that, I'll do every 5,000.
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