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Old 09-27-2012, 08:24 AM   #1
RiSti05
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Default 05 STi, burning oil

05 STi, 110,000 miles, burning lots of oil. I've done a compression/leak down test with DSG in Norwood and everything cleared out (150PSI across the board). I've opened the oil cap, no smoke coming out of tube. I've also had my valve cover seals changed 2 months ago at Wicked Innovation. A few mechanics told me to switch over from synthetic to conventional oil, thicker the better (10W-30?). Fix?

I've done research and couldn't find anyone with the exact problem, so please excuse the thread if it offends you.

Thanks in advance
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Old 09-27-2012, 09:09 AM   #2
cmiovino
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What oil are you running right now?

I know a lot of people are running Rotella 5-40w (thick stuff) with good results. It is synthetic though.
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Old 09-27-2012, 09:11 AM   #3
RiSti05
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Mobile 1, syn
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Old 09-27-2012, 09:26 AM   #4
nathan.d.kim
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I am running Amsoil 10W-40 synthetic for my built motor. You might want a lighter weight on stock internals, but Amsoil is a great quality oil. For me, I used Mobil1 for awhile then had a cracked ring land. Can't definitively say the Mobil1 contributed to that, but I don't use it anymore for a forced induction engine.
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Old 09-27-2012, 10:41 AM   #5
KOJAK-02-WRX
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Everyone says Mobile 1 will be consumed faster than other oils. Have you checked your intercooler for oil? Check PCV to make sure it is working. No oil around your turbo?
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Old 09-27-2012, 10:49 AM   #6
RiSti05
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Quote:
Originally Posted by nathan.d.kim
I am running Amsoil 10W-40 synthetic for my built motor. You might want a lighter weight on stock internals, but Amsoil is a great quality oil. For me, I used Mobil1 for awhile then had a cracked ring land. Can't definitively say the Mobil1 contributed to that, but I don't use it anymore for a forced induction engine.
I'll look into it. Thanks
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Old 09-27-2012, 10:50 AM   #7
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Quote:
Originally Posted by KOJAK-02-WRX
Everyone says Mobile 1 will be consumed faster than other oils. Have you checked your intercooler for oil? Check PCV to make sure it is working. No oil around your turbo?
I've been meaning to check my intercooler, but haven't had a chance. Also, no oil around the turbo.
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Old 09-27-2012, 12:44 PM   #8
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Throw that mobile **** away.

Rotella t6 , amsoil , royal purple.
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Old 09-27-2012, 12:55 PM   #9
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Quote:
Originally Posted by fr0st
Throw that mobile **** away.

Rotella t6 , amsoil , royal purple.
Problem I heard is synthetic burns quicker than conventional, trying to get some input to see if this will stop the smoking
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Old 09-27-2012, 01:01 PM   #10
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Synthetic oils now a days have molecular structures that CAN cause some mild consumption over conventional, but not like ti used to be, you NEED to get rid of the Mobile 1...it simply doesn't work well with the Boxer engines. I stay away from Royal Purple due to the sludge build up I've seen it cause and we only ever run Amsoil, Valvoline Syn or Valvoline (Pennzoil if it's on sale for the DD beaters) conventional.

Oil around the turbo doesn't say much, especially when journal bearing turbo's will putter bits of oil through the charge seals (more so under load) and it can be very slowly taking oil that way as well.

First off, change the brand of the oil, if Amsoil is NOT available, I'd like to run the Valvoline Synthetic formulas.

-Mark
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Old 09-27-2012, 01:19 PM   #11
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How much oil are you burning? Rule no.1. Don't take oil advice from people that can't spell the brand.

I say this at least five times a week here, but here it goes again!!!!!!

There isn't anything wrong with Mobil1 as a brand, you just need to run the proper one for your application. If the API donut on the bottle says Resource Conserving, try one that does not. Mobil1 High Mileage (any grade), Mobil1 0W-40, and Mobil1 Turbo Diesel Truck 5W-40 (thicker than Rotella T6 in all temps) are the robust Mobil1 oils. ANY oil that is Resource/Energy Conserving is nearly designed to shear for fuel economy. The M1 oils that I mentioned all have a higher High Temp High Shear viscosity, have a thicker kinematic viscosity, and contain more anti-wear additives than the Resource Conserving oils. If you're running the "regular" Mobil1 10W-30 or the EP, it is Resource Conserving. Actually, here's a good used oil analysis on Mobil1 5W-30 from a WRX that has only run M1.
http://www.bobistheoilguy.com/forums...11#Post2751611

The new GF5 oils are actually holding up well in turbo Subaru's. Also, consumption my not decline until 2 or 3 intervals on the same oil.

Please stop the misinformation!

-Dennis

Last edited by bluesubie; 09-27-2012 at 01:28 PM.
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Old 09-27-2012, 10:16 PM   #12
dcsti
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How much is "lots of oil" exactly?

"Regular" Mobil 5w-30 is pretty thin, closer to 5w-20 when it is hot. I used it for a while and would burn a quart or two between changes. I'd switch to something else.

I am currently using "German Castrol", which the oil gurus think highly of. The bottles in my personal stash are labeled "Castrol Syntec 0w-30", but I think it is called "Castrol Edge SPT 0W-30" now. The bottle should say "Made in Germany" somewhere on the back. AutoZone carries it.

My car still burns a little oil, but not as bad as before.
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Old 09-27-2012, 10:24 PM   #13
2000G-t
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I run Motul here In canada and I don't lose oil, try that if you could. It's great stuff. but it could be that I change oil every 4000km either way give it a try you won't regret it.
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Old 09-27-2012, 10:39 PM   #14
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i use motul as well with a 3k change. sometimes im off by mileage
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Old 09-27-2012, 11:34 PM   #15
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I just just about any regular 5w-30... no sythetic. I don't burn that much unless i boost all over down like a clown late for work.

1. When i stay out of boost... i burn about 1/4 qrt every 3 months. (04 sti engine)

2. When i boost like a monkey... i but about 1/2qrt every month.


I noticed it really depends on how you drive.
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Old 09-28-2012, 07:31 AM   #16
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Quote:
Originally Posted by DHRDAN
I just just about any regular 5w-30... no sythetic. I don't burn that much unless i boost all over down like a clown late for work.

1. When i stay out of boost... i burn about 1/4 qrt every 3 months. (04 sti engine)

2. When i boost like a monkey... i but about 1/2qrt every month.

I noticed it really depends on how you drive.
I drive normal, no crazy driving and have to fill her up every week.
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Old 09-28-2012, 08:01 AM   #17
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Quote:
Originally Posted by RiSti05 View Post
Mobile 1, syn

well ****, sherlock....we found the problem right here

and change the pcv valve


and ya might have a burnt valve...do a leakdown
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Old 09-28-2012, 03:52 PM   #18
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I was running shop grade 5w-30 in my 2004 STi and my oil was disappearing. I read that switching to Shell Rotella T6 would decrease the consumption, but it did not. Checked the dipstick maybe 1500 miles after changing the oil and it was bone dry.

If I have time this weekend I may pull the PCV thingy and make sure it's not seized up. (I'm guessing if it's bad, I won't hear the clicking sound when I shake it)
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Old 09-28-2012, 04:02 PM   #19
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Quote:
Originally Posted by fr0st View Post
Throw that mobile **** away.

Rotella t6 , amsoil , royal purple.
take out the garbage royal purple out of the equation.
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