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2015 3.6 Limited, 2006 Forester, 2004 OBW 2.5 (sold) . .
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Discussion Starter #1
My 4-banger, 5spd, 04' Outback now has 9,000 miles on it and I have been running Mobil 5w-30 Dino oil in it.

I did a nice gentle and extended break-in period with several oil changes already. I assume the rings are well seated and the engine is plently broken-in.

My question is WHEN is it safe to start running synthetic oil in it?

Thanks!
 

SubaruOutback.org Founder
2018 Outback Limited 2.5L - 105,000+ miles
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10,000 is an ideal time to start using synthetic oil ;) Your seals are seated fine and your engine is broken in fairly well, have no worries. I recommend using Mobil 1 with a Mobil 1 filter as I've had good results with them so far :)
 

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MY12 WRX, MY07 FXT
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Yes, it is absolutely safe for your switch to synthetic now. And I also recommend/use Mobil 1. And if/when you make the switch, use a good filter (Subaru preferably) and you can go 5k between oil changes easily. Brian
 

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Oil

I think Castrol does have a pure synthetic. It is like 0w-30 and it says Made in Germany on the back.

Just a heads up.

I am currently using Amsoil in my 2002 Ranger and I am running it 10,000 miles and then getting an oil change. I will let everyone know how it looks. I have not check it in the last 8,000 miles. :D
 

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2015 3.6 Limited, 2006 Forester, 2004 OBW 2.5 (sold) . .
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Discussion Starter #6
I'm thinking of increasing my syn change interval to ~ 5,000 miles and doing the filter @ 2,500. I have in the past been doing BOTH @3,000! Getting expensive . . . . .
 

SubaruOutback.org Founder
2018 Outback Limited 2.5L - 105,000+ miles
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Now I use Mobil 1 religiously and change both oil and filter every 5,000 miles. Works out great every time ;)
 

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I think that *only* bottles of Castrol marked 'made in Germany' are true synthetic, you're correct that most Castrol you find is not.

I almost forgot- I did my first ever oil change a month ago, using a factory filter & Mobil 1. Everything is fine, there is no piston slap or any such noise. Its probably a coincidence, but I've gotten better gas mileage lately, too.
 
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