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Discussion Starter #1
Anyone heard of doing this? A friend of mine said to do this and then change to synthetic at the next oil change.

Thank you.
 

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Just use synthetic the entire time. Regular oil isn't going to do anything to help the rings seat. Where did your friend hear this?
 

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Just use synthetic the entire time. Regular oil isn't going to do anything to help the rings seat. Where did your friend hear this?
? I don't know if it's true, but using regular oil for the first oil change is considered better for break in than using synthetic oil, until the second oil change. Then, synthetic would be the way to go... Just the way I understand it. :)
 

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If we are talking about the 2011's they come with synthetic so just stick with what Subaru recommends.
 

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Discussion Starter #6
Just use synthetic the entire time. Regular oil isn't going to do anything to help the rings seat. Where did your friend hear this?
Seems to be quite a popular topic of conversation on the 'Net. Lots of information on the subject.
 

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Discussion Starter #7
As far as I know, WRXs are shipped from the factory with synthetic oil….right?

So if "regular" oil is so much better for break-in, why wouldn't Subaru ship the cars with that oil?
 

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The Fruit
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Just use synthetic the entire time. Regular oil isn't going to do anything to help the rings seat. Where did your friend hear this?

probably old school thought that new (read fresh 0 mileage) engines wont break in or break in slow using synthetic oil.
 

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As far as I know, WRXs are shipped from the factory with synthetic oil….right?

So if "regular" oil is so much better for break-in, why wouldn't Subaru ship the cars with that oil?
Excellent point. There are all sorts of theories on break-in and oils, but at the end of the day none of these are supported by anyone that has ever designed or been responsible for the worldwide maintenance of a single Subaru motor, let alone hundreds of thousands of Subaru motors.

Look at the owner's manual. Find an oil that specifically meets the viscosity and grade requirements, and use it at precisely the intervals dictated. That's it.
 

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Discussion Starter #11
Which brings up another question. My manual doesn't specify synthetic oil, it just says that synthetic oil CAN be used. I have heard and read that the wrx needs synthetic oil but am curious why the manual doesn't specify it.
 

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Engine Break In Procedure According to Ron at Raw Performance- Great Read - Subaru Impreza WRX STI Forums: IWSTI.com

"Make sure the engine is full of new non-synthetic oil(see oil suggestions below) and that the oil filter is also full of oil and hand tightened to the engine."

CobbTuning.com - How To Break-in Your Newly Built Engine v1.03

"
Never use synthetic engine oil during this process, use a straight weight, non-synthetic, non-detergent engine oil. You want friction at this point; use an SAE30 oil, non-synthetic, no detergents, etc."

http://www.cosworthusa.com/store/pc/catalog/subaru%20sti%20ej25%20short%20block%20all%20install%20v1.0c.pdf

"During the break-in process, we recommend using a high quality API SJ or newer mineral 20W-50 engine
oil. We also recommend using a genuine Subaru oil filter. Do NOT use a synthetic or synthetic blend
during the break-in process"

http://www.crawfordperformance.com/contact/warranty.cgi

" Break-in the motor for 1000miles/1600km using regular (non-synthetic) motor oil"
 

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Which brings up another question. My manual doesn't specify synthetic oil, it just says that synthetic oil CAN be used. I have heard and read that the wrx needs synthetic oil but am curious why the manual doesn't specify it.
Subaru only recently updated the requirement for synthetic oils. It could be that your manual was simply printed before Subaru published the requirement. That being said, synthetic oils have great benefits over mineral oil for any turbocharged car -- specifically the film strength under extreme heat. Though, that's only after the break-in period...
 

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The Fruit
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Engine Break In Procedure According to Ron at Raw Performance- Great Read - Subaru Impreza WRX STI Forums: IWSTI.com

"Make sure the engine is full of new non-synthetic oil(see oil suggestions below) and that the oil filter is also full of oil and hand tightened to the engine."

CobbTuning.com - How To Break-in Your Newly Built Engine v1.03

"
Never use synthetic engine oil during this process, use a straight weight, non-synthetic, non-detergent engine oil. You want friction at this point; use an SAE30 oil, non-synthetic, no detergents, etc."

http://www.cosworthusa.com/store/pc/catalog/subaru%20sti%20ej25%20short%20block%20all%20install%20v1.0c.pdf

"During the break-in process, we recommend using a high quality API SJ or newer mineral 20W-50 engine
oil. We also recommend using a genuine Subaru oil filter. Do NOT use a synthetic or synthetic blend
during the break-in process"

Crawford Performance - Subaru, Scion, Hyundai Performance

" Break-in the motor for 1000miles/1600km using regular (non-synthetic) motor oil"
and this is all absolutely correct for a fresh virgin engine.. But our engines have already had the initial run in haven't they? Every engine I've ever BUILT fresh I followed the non-syth rules for the first 100mi or so, after that changed over to full synthetic. The scoobie I bought new and ran the original oil till the first oil change interval (3750mi) and then switched to synthetic. So far over 60k mi clocked and no consumption/burning issues. I'd go to say it broke in pretty well.
 

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and this is all absolutely correct for a fresh virgin engine.. But our engines have already had the initial run in haven't they?
Obviously at 1K it's too late for the OP but it was just to illustrate that it is a common practice. Also Amsoil,Royal Purple,Joe Gibbs Racing and a few other companies make an actual "break in" oil. I'm pretty sure Subaru does not break in the motor at the factory.

http://www.subaruforester.org/vbulletin/449277-post15.html
 

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SOC (Canada) don't care what you use as long as it meets the specs in the Owner's Manual and I'm pretty sure that it's the same engine that the US gets.
Maybe so, but SOA is the one that will honor the warranty in the states, so I would adhere to that recommendation.
 
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