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Old 01-31-2005, 09:24 AM   #1
nos
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Default When Cold Low Oil Light comes on. Anyone know why?

When I let my car sit out in the cold for a while, I get an oil light that stays on for a good 5-10 min. It's done this a few times when it's only been 30deg out. This is on the warm side for minnesota. My car is usually in a heated garage. Oil is 10w30 amsoil. level is fine.
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Old 01-31-2005, 09:39 AM   #2
pezman04wrx
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Bad sensor maybe? ... Not sure if it's relative, but I had an older car that always did the same thing, and it turned out to be the PCV valve ... It always tripped the oil light ... Good luck ...
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Old 01-31-2005, 08:39 PM   #3
Colin84
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Switch to a lighter cold weight oil. 0w-30 or 5-30. Your light is on due to a lack of oil pressure due to the oil being cold and thick as molassas. The pump has a hard time getting it sucked up.
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Old 01-31-2005, 10:13 PM   #4
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Please post in the right forum.

There are many experts on different facets of Subaru information. They tend to view and respond in the forums where their knowledge level is highest. By posting in the inappropriate forum, you are not only diluting the wrong forum, but short changing the search results of others and increasing the chances of an expert missing your question.
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Old 01-31-2005, 10:15 PM   #5
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At 30 degrees with 10W30, even dino, you are well within the specified viscosity range for the ambient temperature and there should be no problems with oil flow when cold. You should get that checked out ASAP, if what the light is telling you is correct it means you have less than 2.5 PSI oil pressure which is very, very bad. It may just be a bad pressure switch but why take a chance?
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Old 01-31-2005, 10:40 PM   #6
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id definitely run it by the dealer just in case. better safe than sorry. that way they cant say you neglected the problem and deny your warranty.
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Old 02-01-2005, 11:10 AM   #7
nos
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Problem is trying to get it to do this for the dealer to see. It's not all the time, but a few times it does this.
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Old 02-01-2005, 11:41 AM   #8
vvk
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Impreza GC8 oil filter

Most likely your oil filter by-pass valve is faulty. Are you using a Subaru OEM oil filter? If you do not and your engine gets damaged by low oil pressure, Subaru will not cover it.

The oil is fine (more than fine) -- the problem is most likely elsewhere. I would change the oil filter ASAP and use a Subaru OEM filter. No need to change oil.

When the oil light is on, your oil pressure is VERY low. The light (it's NOT oil level light, BTW) comes on way too late. By the time the light turns on you are running on almost no pressure at all. This is very, very unhealthy for your engine!
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Old 02-01-2005, 01:54 PM   #9
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Quote:
Originally Posted by vvk
When the oil light is on, your oil pressure is VERY low. The light (it's NOT oil level light, BTW) comes on way too late. By the time the light turns on you are running on almost no pressure at all. This is very, very unhealthy for your engine!
This is why an oil pressure gauge is one of the first things i bought for my car.
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Old 02-01-2005, 05:24 PM   #10
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Quote:
Originally Posted by nos
When I let my car sit out in the cold for a while, I get an oil light that stays on for a good 5-10 min....
Next time you see the light come on, shut off the car immediately, unless you want to perform one of those TV tests on your car where they remove all the oil from an engine and then see how long it will keep running.
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Old 02-02-2005, 09:40 AM   #11
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Oil and filter was recently changed "last week". the filter is a purolator pure one. As for warrenty, that's DOA with my upgrades. I have used this brand with my other subaru's without issue.
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Old 02-02-2005, 01:25 PM   #12
vvk
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Impreza GC8 oil filter

Quote:
Originally Posted by nos
Oil and filter was recently changed "last week". the filter is a purolator pure one. As for warrenty, that's DOA with my upgrades. I have used this brand with my other subaru's without issue.
This makes it even more probable that the oil filter is faulty. The by-pass valve in your new filter must be stuck closed.

FYI, flow tests have shown that Pure One has very restrictive media and flows poorly compared to other filters. Subaru OEM is a better choice.
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Old 02-02-2005, 02:00 PM   #13
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Quote:
Originally Posted by vvk
Subaru OEM is a better choice.
...and made by...Purolator.
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Old 02-02-2005, 05:26 PM   #14
vvk
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Impreza GC8 $2 SuperTech and $12 Mobil 1 filters are made by Champion Labs

Quote:
Originally Posted by OneOBS
...and made by...Purolator.
$2 SuperTech and $12 Mobil 1 filters are made by Champion Labs. Are they the same?

Subaru OEM filters are made to different specs. They have 23 psi by-pass vs. generic 12 psi. They have higher quality media. They are made to higher Subaru standards. They are better than generic Purolators.
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Old 02-03-2005, 02:18 AM   #15
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nos - Unscrew the oil pressure sending unit and thread in a real oil pressure gauge (don't forget the teflon tape!). You could go buy one for $50-$100, but you should be able to borrow one from AutoZone for a deposit, usually $20.

vvk - SuperTech filters, while made by the same company, are not the same as Mobil 1 filters. SuperTechs are paper filters where Mobil 1's are synthetic media. There's also a different amount of media and, as I recall, the valve design's different as well as something structural about it. Reinforced can on the Mobil 1's or something. According to my research, Mobil 1's are the Cadillac of oil filters, though they seem(ed?) to suffer from a higher incidence of bursting due to pressure spikes from cold starts. SuperTech's rate as "about average and great for the price." They also have the added benefit that they're at Walmart, a great place to get oil anyway. One stop = Just don't get a Fram. They are crap in extremis. They caused valvetrain noise in every car I've ever put them in and the construction of them (I've verified this by taking one apart) is a study on making a filter on the cheap.
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Old 02-05-2005, 07:14 PM   #16
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I use the Purolators Pure One filter.. I've never had problems with it.
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Old 02-05-2005, 08:21 PM   #17
realwomble
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Quote:
Originally Posted by vvk
FYI, flow tests have shown that Pure One has very restrictive media and flows poorly compared to other filters. Subaru OEM is a better choice.
Where did you read this? Can you post a link?
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Old 02-07-2005, 09:00 AM   #18
vvk
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Impreza GC8 link

Quote:
Originally Posted by realwomble
Where did you read this? Can you post a link?
Here's one:

http://theoildrop.server101.com/ubb/...c;f=6;t=000513
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Old 02-07-2005, 09:25 AM   #19
vapore0n
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Id get it checked. Do you have an oil pressure gauge? At morning startup, mine used to read 6bar (80psi) at idle till it warmed up. Then it would read 2bar at idle when in operating temp
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