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Old 03-04-2013, 10:27 AM   #1
Evilsinner
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Default Grimmspeed aos-Oil Pressure Increase

I installed my Grimmspeed aos yesterday on my 2010 WRX. I noticed my oil pressure is much higher since the install. In the 1500-2500 rpm range I am reading in the 60-80 psi range now. Prior to the install I was in the 50-65 psi range. In the 2500-3500 rpm range I am reading in the 80-100 psi range now prior I was reading 60-80 psi range. Prosport Performance Series Oil Pressure Gauge, car warmed up. I am running full synthetic oil. I live in the Chicagoland area so it has been quite cold here. Is a jump in oil psi common after an aos install? Thank you in advance.

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Last edited by Evilsinner; 03-04-2013 at 10:32 AM.
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Old 03-04-2013, 02:41 PM   #2
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Do you have an oil temp gauge also? Without knowing the oil temp or whether or not the oil was up to full temp makes a difference. Oil temp will lag quite a bit behind coolant temp too so even though you thought your oil might have been up to temp it may not have been.

An AOS shouldn't have any effect on oil pressure though.
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Old 03-04-2013, 03:15 PM   #3
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unless gobs of blow by..
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Old 03-04-2013, 04:15 PM   #4
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Quote:
Originally Posted by adosdrummer View Post
unless gobs of blow by..
...and how would that effect oil pressure?
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Old 03-04-2013, 07:17 PM   #5
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Quote:
Originally Posted by kellygnsd View Post

...and how would that effect oil pressure?
Well hate to tell ya but where the op lives he should have spent the extra money and got the Crawford v2 aos. It utilizes the coolant lines from the turbo to heat up the cylinder so his hoses don't freeze up from condensation. This might not be the case but just a thought!!
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Old 03-04-2013, 09:04 PM   #6
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Quote:
Originally Posted by Evilsinner View Post
I installed my Grimmspeed aos yesterday on my 2010 WRX. I noticed my oil pressure is much higher since the install. In the 1500-2500 rpm range I am reading in the 60-80 psi range now. Prior to the install I was in the 50-65 psi range. In the 2500-3500 rpm range I am reading in the 80-100 psi range now prior I was reading 60-80 psi range. Prosport Performance Series Oil Pressure Gauge, car warmed up. I am running full synthetic oil. I live in the Chicagoland area so it has been quite cold here. Is a jump in oil psi common after an aos install? Thank you in advance.

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exactly....and specifically which one







bet i know
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Old 03-05-2013, 10:48 AM   #7
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Prosport gauges are not really known for their accuracy either. Could be another reason, your oil pressure sending unit may be giving you a false reading
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Old 03-05-2013, 01:03 PM   #8
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Placebo effect
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Old 03-05-2013, 01:28 PM   #9
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Probably placebo! there is a spike in the oil pressure according to the gauge. Do not have oil temp. Mobil 1 5w-30. Thanks again
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Old 03-05-2013, 02:33 PM   #10
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Quote:
Originally Posted by Evilsinner View Post
Probably placebo! there is a spike in the oil pressure according to the gauge. Do not have oil temp. Mobil 1 5w-30. Thanks again
Sir prepare for possible flaming, due to your oil choice..
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Old 03-05-2013, 02:37 PM   #11
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In about 500 miles it will be time for another change. Ive used the Mobil 1 for the last two oil changes now. Im thinkin good time to go with another choice!
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Old 03-05-2013, 03:56 PM   #12
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Dont use that oil.
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Old 03-05-2013, 09:16 PM   #13
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Quote:
Originally Posted by Uncle Scotty View Post
exactly....and specifically which one
bet i know
Quote:
Originally Posted by Evilsinner View Post
Probably placebo! there is a spike in the oil pressure according to the gauge. Do not have oil temp. Mobil 1 5w-30. Thanks again
yeppers......idiots and m1 5w30


and spun bearings
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Old 03-05-2013, 09:21 PM   #14
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Quote:
Originally Posted by kellygnsd View Post
...and how would that effect oil pressure?
blow by is the pressure leaking past the rings into the crankcase.. builds pressure on top of the oil.
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Old 03-05-2013, 09:22 PM   #15
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Quote:
Originally Posted by Uncle Scotty View Post
yeppers......idiots and m1 5w30


and spun bearings
I have built motors that spin to 9000+ rpms on M1.. but not on a Subaru block. Care to quickly elaborate for this Subaru newbie?
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Old 03-05-2013, 09:32 PM   #16
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Quote:
Originally Posted by adosdrummer View Post
I have built motors that spin to 9000+ rpms on M1.. but not on a Subaru block. Care to quickly elaborate for this Subaru newbie?
Nothing wrong with most M1 oils, but their 5w30 synthetic is an "energy conserving" oil. M1, and pretty much all other 5w30 "energy conserving" oils break down to a 20w in less than 1000 miles on our engines, at which point they don't have enough viscosity to adequately protect the bearings under heavy load. Not only that, but the amount of blow-by is ridiculous with M1 and other 5w30 EC oils, which backs up the PCV system, increases blow-by oil consumption, and could potentially cause problems like this.
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Old 03-05-2013, 09:37 PM   #17
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What has the nasioc community decided on as the most recommended oil for 2006+ turbo models?
I have yet to do an oil analysis on the car. I thinks its about time.

And thank you for your quick reply.
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Old 03-05-2013, 09:39 PM   #18
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Most people, myself included, like Rotella T6.
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Old 03-05-2013, 09:41 PM   #19
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Quote:
Originally Posted by adosdrummer View Post
blow by is the pressure leaking past the rings into the crankcase.. builds pressure on top of the oil.
I guess its possible if you have a broken PCV, a perfectly sealed crankcase, and world record blowby but a 20 psi increase at low load and low boost like the OP is seeing... Hell no
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Old 03-05-2013, 09:46 PM   #20
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My bad for quickly reading through the original post, did not compute that it was a 20 psi increase. Insomnia > reading comprehension
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Old 03-05-2013, 09:59 PM   #21
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Quote:
Originally Posted by adosdrummer View Post
What has the nasioc community decided on as the most recommended oil for 2006+ turbo models?
I have yet to do an oil analysis on the car. I thinks its about time.

And thank you for your quick reply.
Most non-EC 5w30 oils would be fine, but many people prefer to use 5w40. The M1 10w30 is actually a fine oil since it's not EC. The most popular oil on the boards is probably Rotella T6 5w40 though. It holds up well, it has lots of additives that other oils are phasing out for cost or environment reasons, and it's cheapish.
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Old 03-05-2013, 10:08 PM   #22
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Quote:
Originally Posted by the suicidal eggroll View Post
Most non-EC 5w30 oils would be fine, but many people prefer to use 5w40. The M1 10w30 is actually a fine oil since it's not EC. The most popular oil on the boards is probably Rotella T6 5w40 though. It holds up well, it has lots of additives that other oils are phasing out for cost or environment reasons, and it's cheapish.
well.....kinda

there are so many m1 oils out there that you can easily get the WRONG one....and there are, really, only a couple GOOD M1 oils for use in hard driven turbo subarus

the high mileage ones and the extended performance should be used rather than their non hm or ep ones

the 5w40 turbo truck and suv or whatever they are calling it now is VERY good as is the 0w40
i mix a quart of either of those or a quart of the 10w40 Racing 4T with a gallon of the rotella t6 in my car and go 8k miles and change it out and forgetaboutit for another 8k miles
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Old 03-06-2013, 12:50 AM   #23
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Scotty what is the advantage of mixing motorcycle oil with the rotella?
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Old 03-06-2013, 01:01 AM   #24
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Scotty what is the advantage of mixing motorcycle oil with the rotella?
^^^^^
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Old 03-06-2013, 02:48 AM   #25
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that would take a long time to 'splain ya adequately....but it makes the oil more oily

lets just say that it makes bearing failure a very distant possibility even at 8k mile oci and the car driven VERY hard fully loaded in 100*F weather with the ac on....all else considered

and the m1 racing 4T is SM rated....so it isnt 'motorcycle' oil specifically

just like the T6 isnt diesel truck oil, specifically
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