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Old 11-09-2005, 04:58 PM   #1
nick04263
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Default Interesting oil problem?

My 04 WRX has 17,000 miles on it (running stage 2) and I change the oil every 2500-3000 miles. I use Mobil 1 5W-30 with Subaru oil filters. When I drain the oil, I get as much as possible out and put everything back together (I am a neat freak) perfectly. So I use a 5Qt bottle to fill up my car but leave just a little at the bottom. I am trying to get as close to 4.6-4.8Qt in the car.

Here is where it gets strange. I put the car down and let it settle, then check the oil before I do anything and always check for leaks. Around the magical 250-300 miles mark 1Qt will dissappear. The oil mark on the stick is at the bottom hole so I put in 1Qt and the mark stays at the full mark right up until I change the oil again. I don't know where the oil is going but it happens everytime. Has anyone had any experience with this? I have an extra 5Qt bottle that I use to top off the 1 Qt everytime and it is 1 Qt EXACTLY. Where is it going? No leaks, nothing in the engine bay, no smoke from exhaust, no buring oil smell.
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Old 11-09-2005, 05:15 PM   #2
boost4life
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Are you filling up the oil filter prior to installing it? Try putting all the oil it will absorb in the filter before installing it . Also keep the oil lvl @ the (h) mark the top dot on the dip stick, for some reason my car uses less if i keep it at the full mark. Also with mobil 1 you will experiance some blow by, many mobil1 users complain of this problem. just keep a close eye on the oil lvl .
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Old 11-09-2005, 05:45 PM   #3
nick04263
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So I should fill up the filter before installing and an additional 4 1/2- 4 3/4 Qts?
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Old 11-09-2005, 05:49 PM   #4
boost4life
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I always do this ,It helps eliminate dry start as much as possible, and I use about 4.5 qts Plus the filled oil filter
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Old 11-09-2005, 08:53 PM   #5
io1029
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I believe the manual says to fill the filter before installing it, so I always make sure to. LOTS of oil fits in that little thing so I'd hate to wait for it to fill up when I first start.
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Old 11-09-2005, 10:06 PM   #6
nick04263
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Thanks guys, this may be all it is. I will make a note to do this each oil change from now on.
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Old 11-10-2005, 12:16 AM   #7
kdogae86
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who cares. i bet the monkeys at the dealership never prime the oil filter. dont waist your time cleaning up the mess
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Old 11-10-2005, 07:19 AM   #8
DrD
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Quote:
Originally Posted by kdogae86
who cares. i bet the monkeys at the dealership never prime the oil filter. dont waist your time cleaning up the mess
what mess? as long as you don't fill the filter until it's almost dripping over the sides, there is no additional mess if you fill the filter.
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Old 11-10-2005, 11:10 AM   #9
Oski
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Just did my 1st oil change on my '06 STi...at 1000 miles. I filled up the new oil filter (yeah, that thing does fit a lot more oil than it would seem) to the top but then realized that I wasn't sure if it was okay for the threads to be covered in oil. So i poured a bit back out so that the threads weren't covered. Was this right? Or is it okay to "fill it to the brim"?
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Old 11-10-2005, 11:48 AM   #10
Ziggyrama
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WRXs are notorious for eating some oil. There are many posts on the forums where people report oil disappearing. I am seeing some loss myself but it is nothing alarming. The oil ends up going into your intake and is burned off. Some of it collects inside your intercooler which is probably the worst thing that happens from all of it because it decreases your IC efficiency.
How does it make its way into your intake? I know of 2 ways:

1. PCV valve and rocker vents - they are both vented into your turbo inlet hose.

2. Turbo seals - oil running through your turbo is passing through the turbine shaft and liquid barings.

The common perception is that most of the oil escapes through option #1. I think it is option #2 that most people are seeing but they don't know it. I used to run a dual, baffled with stainless steel mesh catchcan setup on my car with hope that I would catch all of the oil that I was loosing through my EGR system (option #1). I had 2 cans, 1 for the PCV valve vent and 1 for the rocker vents. After several months of running with this setup, and loosing a quart of oil or so, I caught nothing. There was some residue but nothing that would allow me to declare victory. I even had the cans positioned next to the IC, below the hood scoop vent so that they would get cooled, which would cause the oil vapor to condense due to temp drop. And I got nothing.
So, once I eliminated #1, #2 is most likely the culprit, unless there is yet another way for the oil to escape, other then the obvious (leak). Not much I can do about it other then monitor it and add oil once in a while.
The good news is that your oil is never really old.
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Old 11-10-2005, 12:40 PM   #11
Stanley
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I do think that pre-filling your filter is good, however, I doubt it would explain this odd problem you are having...
I did not think to pre-fill my filter the first couple of times I changed my oil, and my car has only once in almost 70K miles used any perceptible amount of oil.
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Old 11-11-2005, 09:02 AM   #12
bluesubie
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M1 5W30 is too thin to use in a modified WRX in MD (hot summers), IMO. Switch to a 40 weight or a 30 weight that contains esters (Motul 300V, RedLine, German Castrol Syntec).

-Dennis

Last edited by bluesubie; 11-11-2005 at 09:19 AM.
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Old 11-11-2005, 10:10 PM   #13
esteve
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Quote:
Originally Posted by bluesubie
M1 5W30 is too thin to use in a modified WRX in MD (hot summers), IMO.

-Dennis
I keep reading how M1 5W-30 is too thin but I don't think you can make a blanket statement like that with M1. At least in my case I have proof that it's perfectly fine, even in sunny socal. Actually, M1 10W-30 is noticeably thinner...at least with their current formulation.

I did UOAs for both M1 5W-30 and 10W-30 and this is what I got for SUS Viscosity @ 210 degrees F:
5W-30 58.3
10W-30 56.8 (out of spec)

I ran the 10W-30 for 6K miles and the wear numbers were still excellent, but I had to add 1/2 quart which I never had to do with M1 5W-30.

For my next oil change, I think I'm going back to 5W-30. I should've left well enough alone...it's gonna be fun exchanging 10 cases of M1 at Pep Boys!
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Old 11-13-2005, 06:17 PM   #14
rotaman
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does anybody here use quakerstate? i use the 5w-30 full synthetic and have had great results. ive never lost any perceivable amount of oil and it seems to work great. it also says on the back its made with turbos in mind. maybe im just a sucker for marketing but it does seem to work. let me know if anyone has had similar results.
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Old 11-14-2005, 12:48 PM   #15
2fst4u2c
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Who ever is using Mobile One and notices oil consumption, it is defiantly woth trying Amsoil. I had the same problem with M1 now I use Amsoil and I don't use a drop.
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Old 11-14-2005, 01:51 PM   #16
bluesubie
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Quote:
Originally Posted by esteve
I keep reading how M1 5W-30 is too thin but I don't think you can make a blanket statement like that with M1. At least in my case I have proof that it's perfectly fine, even in sunny socal. Actually, M1 10W-30 is noticeably thinner...at least with their current formulation.
I keep forgetting that they thickened up the 5W30 and it's now thicker than the 10W30. That'll confuse anyone.

How's this? "Depending on your driving conditions, driving style and oil change intervals, a GF-4 Energy Conserving oil could be too thin for a modified Subaru".

My UOA on GF-3 M1 5W30 showed 57.8 SUS (in spec, but getting close) after 5,774 miles on the oil. German Castrol Syntec 0W30 had a viscosity of 64.4 SUS after 6,144 on the oil.

-Dennis

Last edited by bluesubie; 11-14-2005 at 01:58 PM.
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Old 11-15-2005, 01:33 AM   #17
esteve
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Quote:
Originally Posted by bluesubie
I keep forgetting that they thickened up the 5W30 and it's now thicker than the 10W30. That'll confuse anyone.

How's this? "Depending on your driving conditions, driving style and oil change intervals, a GF-4 Energy Conserving oil could be too thin for a modified Subaru".

-Dennis
This really just applies to M1, but I don't want people to think 5W-30 is a poor choice when in many cases it's not. Here in socal with our well-known summers, running Cobb stage 2 (pretty mild mod but just to give an example) and driven hard I've found M1 5W-30 to be excellent. I'm not so fond of their 10W-30 on the other hand.

Like you've mentioned in the past, I think the main thing is to find out what works well for your particular car. UOAs are great for that purpose.
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