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Old 02-10-2001, 03:52 PM   #1
adamsrs
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Post Just did a weird oil change!!

I went to change my oil with Full Synthetic 10W-30 motor oil last night. As I loosened the Oil pan bolt ontly about 2 quarts came out, even after I undid the filter too. Where could my car be leaking this much oil? The weirdest part was that there was no oil light on either!
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Old 02-10-2001, 04:09 PM   #2
Opie
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There is this thing called a dipstick that you should use every other gas fill up to check your oil level! Plus the Impreza seems to take a long time to drain all the oil out, I usually pull the drain plug and let it drain for about 20-30 minutes to make sure the old oil is all out.
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Old 02-10-2001, 04:15 PM   #3
8Complex

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Well, considering there is only 4.2quarts in the car to begin with and you only really estimated how much came out, I am assuming there is still about a quart in the oil filter. If you were off in your estimations and there was still oil in the filter, you probably had about 3.5 quarts in, which is still low but not horrible.

I gotta get in the habit of checking my oil often too...
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Old 02-10-2001, 09:02 PM   #4
JDM5LugHatch
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adamsrs-

why would you use 10w-30 when 5w-30 is what is recommended in our cars not including I think every car sold in america. I have heard that using 10w-30 when 5w-30 is all that is required can be bad for the engine. I heard Pat Goss from Goss' garage and Motorweek go into a long explanation about this. He ended up saying that if the auto manufacturers and dealers would cover the car under warranty then Mobil 1's 0w is the best engine oil for cars and that there is really not enough data out there on this so they will not warranty a car that uses the 0w oil. Just a curious question and I am only speaking from what I have heard an "EXPERT" say. I can remember back in the 80's and early 90's it was 10w-30 but now everything is 5w-30.


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Old 02-10-2001, 09:06 PM   #5
98mpreziveRS
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umm..what is suggested for an STI?

just curious..lol..have to find all this out before i put the wrong dino-oil or synth in

thanks
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Old 02-10-2001, 09:59 PM   #6
Patrick Olsen
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Wow, 8, you must use one o' them special oil filters that can warp the space-time continuum. Otherwise I don't see how you could fit a quart of oil into a filter that clearly couldn't hold more than about half that much fluid.

As for using 10W-30 vice 5W-30, I find it extremely hard to believe that it would cause any problems, especially when we're talking about synthetic. Even if it was dino-oil I don't think there would be any problems. 10W-30 is a recommended grade in my Owner's Manual, it just doesn't cover as large a temperature range as the 5W-30. And I'm sure when they decided on the temperature ranges for the different oil viscosities they put a safety margin in there, because there are far too many morons out there to trust everyone to do the right thing.

Finally, to make you feel a bit better, adamsrs, I checked my oil level the other day and it was just barely on the dipstick. No OIL light whatsoever. I'm so used to my '99 not using a drop of oil, that I hadn't been in the habit of checking the '97 regularly. I will now, that I can assure you!

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 02-11-2001, 12:23 AM   #7
munkis
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how do you know only 2quarts came out? did you measure it?

Jay McDade
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Old 02-11-2001, 01:06 AM   #8
CosmoTheCat
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Speaking of oil filters, if I remember correctly the fram # is 3593A is it not? I also remember Tino (the mechanic) put a filter on my old wagon that was like twice as tall as the 3593A. Anybody know that #?
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Old 02-11-2001, 09:12 AM   #9
motorob
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If you spend more time driving in temperatures at the higher end of the temp scale, then 10w-30 can be a better choice for your car. 5W-30 is the recommended grade (mostly for CAFE fuel economy reasons, not any particular superiority of 5w-30 oil), but if you read your owner's manual, you will see that 10w-30 is also allowed by Subaru. If you live where it gets cold, 5w-30 is the better choice because of cold flow characteristics upon start-up. If you live where it gets really hot in the summer or drive at track days, 10w-30 might be better for its high temp protection. There's another argument to be made for 10w-30. Multi-grade oils are made by taking a light-weight base oil, and adding an additive package that makes it act like a heavier grade oil at higher temperatures. So a 5w-30 is basically a 5W oil, 10w-30 is a 10W, they just have additives that give them the properties (protection, etc.) of thicker oils. The additives are the main thing that breaks down over the course of the life of the oil in your engine. Once you have driven the oil 3000-5000 miles, what's in your sump is closer to the lower number than the higher one. So, many lubricant engineeers recommend using an oil with the lowest "spread" between the numbers that still satisfies your manufacturer and your use of the vehicle. Of course, synthetic oils base stocks are so superior to that of "dino" oils that these effects are moderated greatly by their use, although most experts will tell you that using dino oil and changing it frequently (3-5000 miles) is as good as running synthetic. Also, this whole topic is like religion, everybody has an opinion, but I would caution you to pay attention the those people who are knowledgeable and are not trying to sell you something. A lot of the BS that's passed along about oils is spread by the oil companies and parts stores, whose sole interest is in selling a more expensive product.

And yeah, it would be a good idea if you checked your oil every couple of fuel stops. Do it AFTER your finished pumping, that gives the oil some time to drain back into the sump. Another good practice is to religiously record your fuel mileage, it's one of the simplest and best diagnostic toold a driver has. Fuel mileage will clue you into all kinds of things about your driving, not to mention maintenance issues. Fuel mileage can also warn you about mechanical troubles that are too small to be noticed yet.

[This message has been edited by motorob (edited February 11, 2001).]
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Old 02-11-2001, 09:41 AM   #10
Snoopy
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AdamsRS,

You've been doing some hard cornering, haven't you? There was a discussion about this last year about where the oil goes. I can't recall where but most of us autocrossers found our oil to be diminishing between oil changes. I pour a half a liter in every 30 to 45 days coz I don't like to slow down around corners . Must be a Subie thing.

So, to answer your question, it happens. I have no fix. I can only tell you that you're not alone on this. I wonder if Porsches are experiencing the same oil "problem" since they too have boxer engines.

PS - I also reset my trip meter at every gas fill. Normally, in summer, I get about 260 miles per tank. In winter, I get about 240 per tank. If it gets a little low, I check the oil level and it's usually low. BTW, I use Mobil 5w30.

[This message has been edited by Snoopy (edited February 11, 2001).]
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Old 02-11-2001, 11:25 AM   #11
730GTL
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Thumbs up

hi there!
new member,first post,great club
here up north we have to use 0w30,sooo cold, and this is where synthetic shines,at startup.I read a survey that something like 500 taxi cabs in NY city,1/2 of them used synth the other 1/2 dyno oil and because they run 24/7 there was no significant advantage to run synthetics. After dismantling engines for inspection they showed the same wear no diff.
Same survey was mentionning that 90% of dammage to engines was done when engine is cold at startup, the colder the worst,so since synth oil retains higher fluidity,oil pressure gets normal faster and luricates better all parts of motor.Motor is easy to crank up too.I can vouch for that I strarted my car often at -45F without being it plugged in,would even start with remote.
Ron
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