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Old 01-31-2004, 09:09 AM   #1
poison
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Default My engine eats oil when I use synthetic?

I have an 02 TS, w/ 25000 miles. I bought it at 11000, and switched to synthetic immediately.

Over 3 oil changes I had to add a half a quart after 2000-2500 miles, and would change it at 4500-5000. I used Mobil 1 5-30 and K&N oil filters.

My last oil change I put in a Valvoline syn/dino blend and have not used a drop.

Why? Synthetic should be better, period, no?

Thanks. Nate
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Old 01-31-2004, 10:05 AM   #2
orndog
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Do a search, there is much debate in the Subie community. One guy on here did oil analysis with both synth and dino and got less particles when using dino.
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Old 01-31-2004, 12:20 PM   #3
03WRXMA
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Quote:
Originally posted by orndog
Do a search, there is much debate in the Subie community. One guy on here did oil analysis with both synth and dino and got less particles when using dino.
Got a link? And particles of what, the original poster asked about consumption...
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Old 01-31-2004, 01:53 PM   #4
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Quote:
Originally posted by 03WRXMA
Got a link? And particles of what, the original poster asked about consumption...
The post in question was on NASIOC, but I didn't save a link. I think they were metallic particles, and there was some question about the techniques used to compare the different oils' effects. But it was interesting information, and relevant to the poster's last question:
"Why? Synthetic should be better, period, no?"
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Old 01-31-2004, 02:49 PM   #5
drees
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M1 5w30 has a bit of a reputation for being drunk by the engine as it is near the bottom of the 30wt range (ie, thinner than many other 30wt oils). 1qt every 5k miles or so is pretty normal in terms of oil usage.

Living in CA, you can run M1 10w30 which should not burn off as easily as the 5w30.

BTW, those syn/dino blend oils are a waste of money. If you want a good dino oil use Castrol GTX instead. The GTX will be good for at least 5k miles in your 2.5RS, M1 should be good for at least 7.5k miles unless you do a lot of short trips.

I think orndog is talking about oil analysis results between dino/syn oil. I'm not sure what results he's talking about, but frequently if you start using syn oil after using dino, the first couple oil changes will result in higher than normal wear metals as the syn will loosen up deposits left behind by dino oils.

To find out how your oil is protecting your engine, you will need to have it analyzed, I've been using Blackstone Labs myself.
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Old 02-01-2004, 11:16 AM   #6
atabert
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Default oil consumption

I think subaru allows there engines to consume 1 qt every 1000 miles, so there might be nothing wrong?
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Old 02-01-2004, 01:06 PM   #7
Mike Wevrick
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Yeah, that's true. IIRC synthetic flows through tiny spaces better and therefore more is lost around the rings that with dino oil. Anyway 1/2 qt over a 2500 miles is not bad.
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Old 02-02-2004, 01:34 AM   #8
poison
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Default

I asked a couple mechanics about it, they said it is normal in some cars.

Ok, maybe in an M3 or porsche, but this is a n/a Subaru, certainly not a high performance car. I have never heard of a Japanese econobox ( ) doing anything like that.

But then I have no previous experience with Subarus. The boxer is different, for sure.

My 95 Golf with 100,000k barely ate that much...

It doesn't really have anything to do with how my oil is breaking down or metal particles, but I guess I should have it tested at Backstone labs...
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Old 02-05-2004, 09:50 AM   #9
vvk
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Impreza GC8 normal

I have seen this many times in various vehicles. Synthetic gets consumed much more than non-synthetic.

Here's my original thread about Castrol GTX vs. Mobil 1 and Motorcraft vs. Mobil 1:

Castrol GTX vs. Mobil 1 vs. Motorcraft

If you look at the spreadsheet of oil analysis that was posted recently, you will see that the lowest wear came from using non-synthetic oil.

Subarus just don't like synthetic oil.
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Old 02-05-2004, 12:27 PM   #10
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Default Re: normal

Quote:
Originally posted by vvk
Subarus just don't like synthetic oil.
That's way too much of a blanket statement. My WRX is producing very low wear numbers with synthetic (M1), and I have also seen very low wear numbers with Amsoil.

Being turbo charged, there is no way I would run dino oil long-term because of the heat the oil sees near the turbo, if I had a normally aspirated engine then I would consider it.
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Old 02-05-2004, 01:48 PM   #11
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Quote:
Originally posted by poison
Ok, maybe in an M3 or porsche, but this is a n/a Subaru, certainly not a high performance car.
This is why, in my VERY humble opinion, that spending extra money on synthetic oil is a complete waste of money for your car. Unless you are piling tons of miles on in a relatively short period of time and want to significantly increase your drain intervals, I see no point in using synthetic oil in an engine which is not highly strung (S2000, M3, motorcycle or any forced induction car). Consider the number of Honda's, Toyota's, Subaru's, Volvo's, etc. that have a quarter million miles on the engine using dino oil!

FWIW, I've been running Mobil 1 in my WRX since 10K miles: 10-30 in the summer and 5-30 during snowboarding season. I'm at 44K now and the engine has not consumed any oil at all. So I think that saying "Subarus don't like synthetic" is a gross oversimplification.
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Old 02-10-2004, 05:29 PM   #12
Richard L.
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I switched to Mobil 1 5W-30 synthetics shortly after I bought my RS, and the car consumed very little or no oil between oil changes when it had less than 40K miles. Currently, the car seems to be burning about 1/4 quart of oil every 5000 miles.
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