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Old 07-15-2007, 10:58 AM   #1
alanlcit
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Default Used Oil Analysis - Castrol Syntec 10W40 - Subaru WRX STi

So, here's the results of my first oil analysis. The Castrol didn't fix all my oil consumption issues (a total of about 1 qt consumed over 3.3k miles). But that's a bit better than Mobil 1 in terms of consumption (would have been in excess of 1.5qts over that distance). I never did a UOA with Mobil 1, so I can't really say how it compares in that way.

I didn't drive particularly aggressively during this interval - a few spirited on-ramp pulls, not much else.

As they recommend, I'll take the next oil to 5000 miles, and see what it looks like. I know where to find Syntec 5W40 now, so I'll be using that for my next oil change instead.

Any comments?

http://picasaweb.google.com/alanlcit...92688252247586
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Last edited by alanlcit; 07-17-2007 at 12:12 AM.
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Old 07-15-2007, 12:38 PM   #2
Engmus
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Perhaps try auto-rx?

That completely stopped my oil consumption when I first got my STi over a year ago.

Haven't consumed any oil since, or at least its so minimal I can't tell the difference on the dipstick.

Overall looks good.
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Old 07-15-2007, 03:00 PM   #3
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Did you add 1 qt or 0.6 qts of make-up oil? Post says 1 and picture says 0.6. Not a huge difference... either way, at least it went down. Everything looks good, but the viscosity is barely a 40 weight - 65.6 ... My GC 0w-30 was 64.8 after 4K.

Also, I believe in giving any oil at least two UOAs. One sample is simply not enough data IMHO.
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Old 07-16-2007, 03:50 AM   #4
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Looks good. As other's mentioned it's fairly thin for a 40wt oil, but nothing to worry about. It should thicken up a bit with more miles on the oil.

I'd take it to 5k for the next oil change, especially if you continue to add 1/2 quart every couple thousand miles, it helps keep the oil fresh.
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Old 07-16-2007, 11:22 AM   #5
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Quote:
Originally Posted by FD777 View Post
Did you add 1 qt or 0.6 qts of make-up oil? Post says 1 and picture says 0.6. Not a huge difference... either way, at least it went down. Everything looks good, but the viscosity is barely a 40 weight - 65.6 ... My GC 0w-30 was 64.8 after 4K.

Also, I believe in giving any oil at least two UOAs. One sample is simply not enough data IMHO.
I added 0.6qts over the course of the time that the oil was in the car. However, after measuring the volume of oil removed from the car when changing the oil, I found that an additional 0.4qts had been burned, that I had not replaced. (In other words, the oil was not up to the full line when I drained it.) So a total of about 1 qt consumed over 3300 miles.

Thanks for the info about the viscosity...I'll poke around for a readily available synthetic 5W40 weight oil that's a bit thicker...hard to find. I will give the 10W40 another 5000 miles before changing to the 5W40, though. In the summertime, no problems with the 10W40, but I guess I'd prefer a thinner oil on startup in the "winter".
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Old 07-17-2007, 11:36 AM   #6
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OK, so the oil is not a thick 40-wt. Do you have any reason to think this oil is not thick enough? Your wear metals are certainly not high. Why worry about trying to find something thicker than this?
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Old 07-17-2007, 11:56 AM   #7
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Quote:
Originally Posted by bulwnkl View Post
OK, so the oil is not a thick 40-wt. Do you have any reason to think this oil is not thick enough? Your wear metals are certainly not high. Why worry about trying to find something thicker than this?
...because the engine is CONSUMING it.....THAT is one(just one) of the ways to know that the oil ya using is too light
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Old 07-17-2007, 01:29 PM   #8
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Quote:
Originally Posted by Uncle Scotty View Post
...because the engine is CONSUMING it.....THAT is one(just one) of the ways to know that the oil ya using is too light
Not necessarily. Popular answer, but frequently wrong.
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Old 07-17-2007, 05:11 PM   #9
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Quote:
Originally Posted by bulwnkl View Post
Not necessarily. Popular answer, but frequently wrong.
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Old 07-19-2007, 12:32 AM   #10
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Quote:
Originally Posted by bulwnkl View Post
OK, so the oil is not a thick 40-wt. Do you have any reason to think this oil is not thick enough? Your wear metals are certainly not high. Why worry about trying to find something thicker than this?
From what I've read in the hundreds of threads on oil consumption on this forum, it is possible to find oils that won't disappear. Also from what I've read, often this isn't directly related to the oil's viscosity - flash point/volatility also plays a role. So it may be that I won't look for a thicker oil...as you say, the wear metals look good, so I'm probably adequately protecting my engine. I actually have some thinner Amsoil 5W30 that I'm going to try as well at some point. I'll do a UOA there as well.

As you can probably tell from the above, I don't believe it matters that much to change engine oil brands constantly. That being said, I'll eventually settle with something that makes me happy and stick with it, just in case there's something to the rumor.

Oil that disappears (burns, blows-by, vaporizes, teleports, whatever...) is annoying to me, because it means I have to constantly be refilling, particularly when running a 5k interval. With Mobil 1 5W30/10W30, I would have run out of oil if I had tried a 5k interval without topping up! Fortunately I never ran more than 3500 miles with it... In any case, all this extra top-up oil costs money (about $10 additional per oil change when running a synthetic) and is a (very minor) pain. Neither of these things are that important, but it's kind of a puzzle for me to try to solve...either I will "fix" the consumption, or I won't.

So I'll experiment, take data with UOAs, and keep pinging this forum to see what people think. I figure I won't do that much damage to the car by experimenting with oils...
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Old 07-19-2007, 12:59 AM   #11
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It's a Subaru they eat oil, more so than say a corrolla. Not to mention that it's a turbo, they are a bit hungrier. Still you should be using Valvoline anyways
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Old 07-19-2007, 04:59 AM   #12
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Quote:
Originally Posted by busygettingthere View Post
It's a Subaru they eat oil, more so than say a corrolla. Not to mention that it's a turbo, they are a bit hungrier. Still you should be using Valvoline anyways
What's so special about Valvoline? I've been using Castrol 0w30 (german variety) and it's been doing well for me in all aspects including oil consumption. I do burn off around .75-1 quart, but that's over a span of 8000 miles. I get pretty good gas mileage to boot with spirited driving (average about 310mi/fill).
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Old 07-20-2007, 12:40 AM   #13
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I only got 8-14 mpg's with my STi
And I burn 1 qt every 5k with my 2.5i
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Old 07-20-2007, 03:16 AM   #14
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Quote:
Originally Posted by bulwnkl View Post
Not necessarily. Popular answer, but frequently wrong.
Quote:
Originally Posted by Uncle Scotty View Post
?! QUE !?
Sorry Scotty, bulwnkl is right.
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Old 07-20-2007, 07:11 PM   #15
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Quote:
Originally Posted by busygettingthere View Post
I only got 8-14 mpg's with my STi
And I burn 1 qt every 5k with my 2.5i
That's incredible! I have averaged 20mpg over the life of my STi, worst tank ever was 17.5mpg. I guess you either have a lot (all) city driving or you like to race between stoplights...I accelerate aggressively, but I usually coast to a stop...

I understand some oil consumption is to be expected. I'd be happy with 0.5qt/3k miles. (Again, M1 was at least 3x this amount.) That's what I had with my previous Subaru. I'm not that far from this goal now with the Castrol, so we'll see. There may yet be an oil out there that does better than what I've got.

I've seen no evidence that a particular brand of oil is "the right one." And isn't "Valvoline" an overly general recommendation?
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Old 07-21-2007, 12:55 AM   #16
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I did tear around, sped up for stop signs, slowed down on hills to boost again, etc. I just tried not to affect the others on the road. I get 18/30 in my 2.5i city/pass crossings.
I have always used valvolione. The thing that sticks out in my mind and the reason I said it was an engine(drag race chevy's) builder friend of mine who I trust worked in a cadillac (ugh) dealership for a long time and anytime they would have issues on customer concerns with oil consumption they would just substitute the crap penzoil for Valvoline and the consumption problem would pretty much go away. Broad reccomendation yes I would not reccomend a viscosity or conv/syn to anyone just brands and yes they are quite a few other reccomendable brands, and many more to stay away from.
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Old 07-21-2007, 01:21 PM   #17
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I get roughly 20mph on my Sti, I burn Zero oil, or so little it doesnt impact the dipstick.

I run 3k oci's using Purolator PureOne oil fitlers and Redline 5w30 during winter and 10w-30 during summer.

I also auto-rxed my engine, transmission and rear diff with great results.
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Old 07-21-2007, 03:25 PM   #18
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Quote:
Originally Posted by drees View Post
Sorry Scotty, bulwnkl is right.


...d00000d....the ammount if misinformation and wives tales and purs BS on this board is HUGE

...and I'm not the one posting it.
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Old 07-23-2007, 03:32 PM   #19
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Good ole N. American Castrol Syntec! A few people on bitog were recently attacking Castrol when someone posted a UOA from a 1.8L Toyota where the 5W30 sheared to a 20 weight.

Click here from my last UOA on Motul and check my viscosity on the older German Castrol Syntec 0W30 UOA's. SUS was over 66 on two different 7,000+ mile runs. Yours may have thickened up with a longer interval. Try a diesel 5W40 (Rotella-T) or an ester based oil like Redline/Motul to help with consumption.

I'm back with GC for summer.

-Dennis

Last edited by bluesubie; 07-23-2007 at 03:39 PM.
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Old 07-24-2007, 03:09 AM   #20
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Quote:
Originally Posted by Uncle Scotty View Post
the ammount if misinformation and wives tales and purs BS on this board is HUGE
You saying you are right in big bold text doesn't make you any more right than you were before.

Care to back up your claims with facts instead of frantically waving your hands in the air?
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