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Old 01-22-2005, 07:18 PM   #1
othon
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Join Date: May 2002
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Location: so cal
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2004 WRX Wagon STG 2
big things coming...

Default "Going back in time?".............

So I bought a 2004 Subaru WRX wagon, up till 12,000 miles I was using Castrol GTX 5W 30. Then switched to Mobil 1 Synthetic 10W 30, after the first due date to change the Mobil 1 I noticed that the boxer motor had burned some oil. So I picked up some Mobil 1 15W 50 and when it was time to change that oil, I noticed it had burnt through some of that as well.

I did some research on some Subaru forums and noticed people (okay a lot of people talking about this) saying that when they switched to synthetic that they noticed the car burning oil.
Now other people that are still using regular dino oil are not noticing this problem.

So Iím going back to Dino oil, Castrol 20W 50 (I live in a hot area and like to run up and down the mountains around my area in southern California.)

What I would like to know which Iíve been having problems finding a definitive answer isÖÖ

"When I switch back to normal oil after using synthetic, should I run normal oil in the car for a few miles then drain that and add in the normal oil Iím going to keep till the next scheduled time? Or dose it not matter, cause some motor builders have told me that it dose help to do this because of the two oil's make up."

Just wanted to know what other people know about this and what they think.
Or if my A$$ became a chimney.
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Old 01-22-2005, 08:45 PM   #2
Unabomber
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Read the Oil FAQ. Use OEM recommended weight oil. Choose regular or synthetic. Stick with regular or synthetic or switch willy-nilly as it doesn't matter.
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Old 01-22-2005, 09:14 PM   #3
BryanH
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I noticed oil loss on Mobil1...so I switched to Castrol Syntech and no more oil loss...
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Old 01-22-2005, 10:47 PM   #4
othon
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big things coming...

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Quote:
Originally Posted by BryanH
I noticed oil loss on Mobil1...so I switched to Castrol Syntech and no more oil loss...
good to know cause the more i read about people saying (after they have delt with issues,) that there mostly running "CASTROL" products and are happy with the resaults of using Castrol.

Even more intresting fact is that i had a 2002 2.5 RS before my 04 WRX wagon
and i switched to Mobil 1 around 7000 miles and around 20000 i had a new short block replacement after 40% leak down on 2 sets of rings.

Also I wasnt having any noticiable oil loss till I switched to Mobil 1 again on my WRX which i should have learned from my earlier run in with Mobil 1.

heh!
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Old 01-23-2005, 02:39 PM   #5
Psydotek
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I change my oil every 5k mailes, mostly freeway daily driving with 30-40% slow and go. I use Castrol Syntec 5w-30 (so cali here). It usually seems i burn off maybe 1/4 a quart by the time i'm ready to change oil.
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