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Old 05-24-2017, 04:31 PM   #1
DesertWRX11
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Default oil pressure hits 0 when coming to a stop

I have a 2011 WRX. I live in AZ, so itís hot. Even the winter is pretty warm. Car mods Ė SF intake with Torqued performance E tune and magnaflow catback, thatís it. I use Subaru synthetic 5W30 oil.

I had the Defi racer oil pressure gauge for over a year and noticed that occasionally my oil pressure would drop to 1 or 2 and kick back up. This only occurs during deceleration, usually when I go into neutral and start coming to a stop. Otherwise my idle is around 10psi. I just installed the Defi BF oil pressure gauge. It has an alarm. I set the alarm to beep at 2 psi. Now I am becoming more aware at how often my car drops to nearly 0 psi when coming to a stop. The sender unit is located under the alternator.

Anybody else seeing numbers like this? I am still at 100psi or so on cold start, 60-90psi on the freeway, 40psi or so on surface streets. I donít believe itís a bad sender because two gauges have indicated the same thing.
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Old 05-24-2017, 05:02 PM   #2
Dave D.
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15w-40.

Last edited by Dave D.; 05-24-2017 at 05:07 PM.
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Old 05-24-2017, 05:15 PM   #3
Max Capacity
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Have agree I'd use a better oil. Both my cars run year round in CT on 5w-40 Amsoil.

You do realize that if your really getting 1-2psi of oil pressure...that's not good. You may want to get a direct reading oil pressure gauge and keep electronic's out of it.

I'm not a big fan of electronic oil pressure gauges.
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Old 05-24-2017, 05:29 PM   #4
DesertWRX11
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Quote:
Originally Posted by Max Capacity View Post
Have agree I'd use a better oil. Both my cars run year round in CT on 5w-40 Amsoil.

You do realize that if your really getting 1-2psi of oil pressure...that's not good. You may want to get a direct reading oil pressure gauge and keep electronic's out of it.

I'm not a big fan of electronic oil pressure gauges.

Thanks for the info! I guess I am trying to gauge how bad it is by seeing if this is common or not or possible trouble shooting
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Old 05-24-2017, 06:10 PM   #5
Max Capacity
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Quote:
Originally Posted by DesertWRX11 View Post
Thanks for the info! I guess I am trying to gauge how bad it is by seeing if this is common or not or possible trouble shooting
It's pretty common knowledge on the LegacyGT ,com forum that if your seeing oil pressure that low, its already to late.

I assume you have a bad gauge.

Even back in the 1970's my car had direct reading oil pressure, water temp and oil temp.

http://www.stewartwarner.com/en-US/P...-Pressure.aspx

Our 9 second Civic, 10 years ago had direct reading gauges also. The benefit in a race car is the temp gauge reads even when the key is not turned on.
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Old 05-24-2017, 08:03 PM   #6
DesertWRX11
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Quote:
Originally Posted by Max Capacity View Post
It's pretty common knowledge on the LegacyGT ,com forum that if your seeing oil pressure that low, its already to late.

I assume you have a bad gauge.

Even back in the 1970's my car had direct reading oil pressure, water temp and oil temp.

http://www.stewartwarner.com/en-US/P...-Pressure.aspx

Our 9 second Civic, 10 years ago had direct reading gauges also. The benefit in a race car is the temp gauge reads even when the key is not turned on.
I wish it was a bad gauge. I'm inclined to think it's something worse since I've had two gauges with similar readings. I should note it doesn't always dip to 2psi or lower. But I figured even a handful of times over a week is too much. I better purchase a secondary gauge to compare or take my car to a shop and see what I can find out. I only have 85,000 miles and baby this car including how I drive it so it will be a bummer to find something big going wrong!
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Old 05-25-2017, 01:14 PM   #7
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I wonder who makes that Subaru oil ?

We know the Mobil 1 5w-30 breaks down to a 5w-20 quickly. They say other Mobil oils are ok.

Lot's of guy's run Shell Rotella t6 year round and have no issues.

Personally I would not use a 5w-30 in your location. I start my cars when its -20+F and have no problem with the 5w-40 Amsoil.

I also don't let the cars warm up in the driveway. Even if it's -29F. Start it, clean off the frost if needed, it normally doesn't snow if it that cold and drive it easy till the temp comes up to normal. My winter weekend drive is about a mile to the ski hill both mornings with a 2.5 hour highway drive to get there and come home Friday night and Sunday night.

You can use most good name brand oil, you don't have to use Subaru oil.
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Old 05-25-2017, 02:09 PM   #8
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Since the oil pickup tube appears to have never changed from 2005 onward, it's entirely possible that the 2011+ cars are susceptible to the failures the 2004-2008 cars saw. Low oil pressure was the tell tale sign there.

Might be worth dropping the pan to check the tube for cracks. More here.

https://forums.nasioc.com/forums/sho....php?t=1553337
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Old 05-25-2017, 02:19 PM   #9
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Quote:
Originally Posted by Max Capacity View Post
I wonder who makes that Subaru oil ?

We know the Mobil 1 5w-30 breaks down to a 5w-20 quickly. They say other Mobil oils are ok.

Lot's of guy's run Shell Rotella t6 year round and have no issues.

Personally I would not use a 5w-30 in your location. I start my cars when its -20+F and have no problem with the 5w-40 Amsoil.

I also don't let the cars warm up in the driveway. Even if it's -29F. Start it, clean off the frost if needed, it normally doesn't snow if it that cold and drive it easy till the temp comes up to normal. My winter weekend drive is about a mile to the ski hill both mornings with a 2.5 hour highway drive to get there and come home Friday night and Sunday night.

You can use most good name brand oil, you don't have to use Subaru oil.
I read up on t-6 and I like what I see!! I think I will switch to this oil and hope my oil pressure stays up! I will post an update at some point! Thanks everyone for the feedback!!
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Old 05-25-2017, 05:15 PM   #10
Max Capacity
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On my drive home today...I wondered what your idle rpm is ? is it low for some reason ?

Cobb AP or a Tuner can raise that.
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Old 05-25-2017, 07:20 PM   #11
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Desertwrx11, I actually have the same problem as you with my 13 WRX with the TP tune and Mobile 1 5w30. I just installed some prosport guages with the relocation kit and have noticed after an extended or spirited drive my oil pressure will dip to 10psi or less when coming to a stop in neutral. Mine idles at ~600 on his stage 3 tune.
I sent off an oil analysis to Blackstone to see if I might have an engine problem, and it came back clean. You might want to look into doing that as well as a precaution.
If you switch to T6 and notice a difference in pressure at idle please let us know.
I might do an early oil change this weekend and switch - if I notice a difference I will let you know also.
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Old 05-25-2017, 09:58 PM   #12
DesertWRX11
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Quote:
Originally Posted by ScoobyNooblet View Post
Desertwrx11, I actually have the same problem as you with my 13 WRX with the TP tune and Mobile 1 5w30. I just installed some prosport guages with the relocation kit and have noticed after an extended or spirited drive my oil pressure will dip to 10psi or less when coming to a stop in neutral. Mine idles at ~600 on his stage 3 tune.
I sent off an oil analysis to Blackstone to see if I might have an engine problem, and it came back clean. You might want to look into doing that as well as a precaution.
If you switch to T6 and notice a difference in pressure at idle please let us know.
I might do an early oil change this weekend and switch - if I notice a difference I will let you know also.
Awesome man!! Thanks for the info!! Ya mine seems to be after freeway driving or spirited driving. I haven't heard of blackstone but I googled it and I think I should probably do that as well! When I switch to t6 I'll post my experience!
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Old 05-25-2017, 10:02 PM   #13
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Electronic gauges are not known to be exceptionally accurate. Get a $15 mechanical gauge and verify the pressure is good. It's a handy tool to have in your toolbox anyway. Once you know that's we'll go from there.
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Old 05-25-2017, 10:33 PM   #14
DesertWRX11
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Quote:
Originally Posted by KillerBMotorsport View Post
Electronic gauges are not known to be exceptionally accurate. Get a $15 mechanical gauge and verify the pressure is good. It's a handy tool to have in your toolbox anyway. Once you know that's we'll go from there.
sounds good!! Then I might be purchasing one of your oil pickups!! They look good!

Last edited by DesertWRX11; 05-25-2017 at 10:49 PM.
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Old 05-26-2017, 08:42 AM   #15
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Quote:
Originally Posted by Max Capacity View Post
On my drive home today...I wondered what your idle rpm is ? is it low for some reason ?

Cobb AP or a Tuner can raise that.
I'll have to watch my idle. This morning when coming to a stop, I watched my idle dip down to about 600 but then stay around 750 during the stop. However it's 76 this morning and when I was getting the low oil pressure warning it was 101 out and I was running my a/c. I don't know if that would affect my idle. I think that would actually make my idle higher...

Last edited by DesertWRX11; 05-26-2017 at 08:50 AM.
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Old 05-26-2017, 09:03 AM   #16
Max Capacity
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FWIW, I had my Tuner increase my idle speed years ago. I do coast a lot with my cars. Lots of hill's around where I live.

I also like to coast when exiting the highway to give the turbo a chance to cool down. I normally coast down the big hill before I turn onto my street, the hill is about 3/4 mile long. It's easy to get over 60mph coasting down it starting out from coasting around 20mph.

IMO 600 is to low for idle. Even 750 is low. I'm over 850. Oil pressure is one of the most important things... both my cars are manual
transmissions.


I also use Blackstone Labs. Good people.
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Old 05-26-2017, 09:44 AM   #17
DesertWRX11
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Quote:
Originally Posted by Max Capacity View Post
FWIW, I had my Tuner increase my idle speed years ago. I do coast a lot with my cars. Lots of hill's around where I live.

I also like to coast when exiting the highway to give the turbo a chance to cool down. I normally coast down the big hill before I turn onto my street, the hill is about 3/4 mile long. It's easy to get over 60mph coasting down it starting out from coasting around 20mph.

IMO 600 is to low for idle. Even 750 is low. I'm over 850. Oil pressure is one of the most important things... both my cars are manual
transmissions.


I also use Blackstone Labs. Good people.
Sounds good, I coast a decent amount too. I think I will look at bumping up my idle a bit with my accessport.
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Old 05-31-2017, 11:39 AM   #18
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Replacing my oil pickup next week and switching to rotella t6. I will post back results about my oil pressure after the install. I was informed by a shop that I also might have loose oil pump which causes an internal oil leak. Going to do the oil pickup first and go from there!
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Old 06-08-2017, 12:54 AM   #19
DesertWRX11
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Installed the killer b oil pickup. I did not find any crack in my stock oil pickup like I thought I would. I also switched to t6 5w40. After priming my oil pump, I started my car and took it for a drive. I never dropped below 20 psi so that is an improvement!!! Still need to do some more driving and see if my issue is resolved.
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Old 06-11-2017, 02:08 PM   #20
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For oil pressure comparison//
I have a 2014 Wagon that's been at stage 2 + since 500 miles. The idle speed is 850-900 rpm. I have about 70k milage now. I've run T6 since the first change ( 500 miles) and I drive it year round ( in Indiana).
Cold start pressure - around 105
Hot idle 30-45 depending on how hot I've gotten it.
2000-2400 rpm cruise - 80-90 psi.
Hope this helps.
Dave
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Old 06-11-2017, 08:39 PM   #21
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Quote:
Originally Posted by DesertWRX11 View Post
Replacing my oil pickup next week and switching to rotella t6. I will post back results about my oil pressure after the install. I was informed by a shop that I also might have loose oil pump which causes an internal oil leak. Going to do the oil pickup first and go from there!
My pickup was cracked and I'd never have found it if my shop doing the work hadn't pointed it out to me. It was a hairline crack right along the brazing.

Quote:
Originally Posted by DesertWRX11 View Post
Installed the killer b oil pickup. I did not find any crack in my stock oil pickup like I thought I would. I also switched to t6 5w40. After priming my oil pump, I started my car and took it for a drive. I never dropped below 20 psi so that is an improvement!!! Still need to do some more driving and see if my issue is resolved.
Glad you're finally holding oil pressure! A little tip to keep it that way is when doing spirited driving / pulls always shift to the next gear or simply lift throttle to engine break. Don't ever drive hard and coast with the clutch in immediately after a pull because your oil pressure drops along with the rpms, your bearings will thank you.
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Old 06-14-2017, 04:54 PM   #22
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Careful what you find about T6 these days...less than a year ago, their composition changed and it has less zinc for emissions purposes. Zinc is what makes oils good or bad for our cars.

I switched to Schaffer's oil after the T6 change. I'd call up Flatirons Tuning if you have any questions about the Rotella. Trust me, I ran it for years. It's about 2x more to run the Schaffer's and I was sorry to see it go.

I assume you have a stock oil pump, not aftermarket right?
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Old 06-16-2017, 05:44 PM   #23
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Using a heavier oil to bring the oil pressure up to normal seems like treating the symptom. Could the cause not be excessive mains clearance or a dozen other serious issues?
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Old 06-16-2017, 07:15 PM   #24
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Quote:
Originally Posted by tyrebyter View Post
Using a heavier oil to bring the oil pressure up to normal seems like treating the symptom. Could the cause not be excessive mains clearance or a dozen other serious issues?

Or he is now using the correct oil for the temperature conditions in his area
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Old 06-16-2017, 08:23 PM   #25
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I hear a light rattling noise when in first gear simply moving out of a parking lot. I wonder if my heat shield on my exhaust is the issue. It concerns me it might be in the transmission. Shifting from 2 to third I can feel a catch in the shifter. Has anyone one experienced anything similar?
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