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Old 06-15-2003, 02:41 AM   #1
JLMarx
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Default HELP! My oil temp is out of control!

For starters, I have basically a TXS Stage 2 setup with an uppipe. I usually see around 195F - 200F in normal driving conditions.

This afternoon I took a fairly short, but spirited drive through some twisties that saw my oil temps reach about 215F for maybe 10 - 15 minutes. After the spirited driving was over the oil temp returned to normal. Several hours later, I drove 45 minutes on the highway to a friends house and I glanced over at the oil temp gauge because I noticed that the warning light was on to see a temp of 235F!!! On the way back home just now the oil read a constant 235F the whole way, and I was driving like a grandma! For what it's worth, the water temp and EGTs were both normal.

What could have caused this? Is it possible that the oil cooler failed? Oh yeah, I doubt it makes any difference, but I just had the oil changed 3 days ago by the dealer, although I did have them put Mobil 1 in instead of the OEM oil.

Any help would be much appreciated!
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Old 06-15-2003, 02:55 AM   #2
hotrod
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Default check the obvious

Well to start with you need to check the obvious.

What's your oil level?

If it is low either the dealer did not put in enough, or you have a leak and are losing oil.

Reduced oil capacity will raise temps because the oil has less time to cool between successive passes through the engine.

If both those check out, I would talk to the dealer, you may have a bad oil filter that has plugged up some how, ie collapsed filter element or some such.

Larry
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Old 06-15-2003, 03:47 AM   #3
JLMarx
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Default

Thanks for the reply...

I did already think of the fact that I may be losing oil. I don't think that the dealer neglected to fill it up all the way because they used 5 of the 6 quarts in the box, which is the correct amount, and I have been driving for 2 days since the service with no problem. I thought that I may have done something to cause an oil leak this afternoon, but there were no oil stains/pools where I parked my car, so I ruled that out. I haven't actually checked the level though, so I can't be totally sure. I'll do that tomorrow.
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Old 06-15-2003, 09:04 AM   #4
hotrod
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Default Check cooling system also

You might also want to take a look at the cooling system.

You said the water temp read normal, but if the sender is bad that may not be useful information.

( by the same token the oil tempearture sender may be bad and reading high also )

I also personally had a situation about 15 years ago where a bad lower radiator hose caused me to lose most of my coolant. The temperature gauge read NORMAL even though the engine was dry of coolant. The only thing cooling the engine was the synthetic oil. It got mighty hot but saved the engine from a catastrophic failure.

Turns out on that specific engine when the engine lost all its coolant the temperature sensor was only being heated by conduction through the metal of the intake manifold and it stayed at a normal operating temp.

Just a thought.

Larry

Last edited by hotrod; 06-15-2003 at 09:58 PM.
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Old 06-15-2003, 11:59 AM   #5
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Default

235F isn't any reason to get excited. You WANT temps to go above the boiling point of water in a production car, but not exceed it by a large margin.

Start worrying a little when they hit 260-270F.
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Old 06-15-2003, 01:53 PM   #6
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A jump in oil temps like that is not normal. How long have you had the TurboXS stage 2?

Are you running the UTEC? check your fuel trim to make sure your not running too lean. that could cause the EGT temps to rise along with the oil temps.
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Old 06-15-2003, 02:22 PM   #7
JLMarx
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Default

Thanks for the info...

I have a feeling that the 2 most likely causes are a loss of oil and something wrong with the cooling system, as hotrod suggested. Either way, I am going to take it to the dealer to investigate I think.

I realize that 235F isn't quite the "danger zone" yet, but to have it jump 40F in normal operating temp is something that definitely needs to be invetigated.

ChrisW - I do have the Stage 2 w/ UTEC, however I have had it for at least 10,000 miles with no problems whatsoever. I am using the base Stage 2 map, which I have tested/logged and found no abormal results, knocking, etc. Since I haven't seen an increase in EGTs, I figure a A/F ratio problem is pretty unlikely.
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Old 06-15-2003, 02:23 PM   #8
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Quote:
Originally posted by GrocMax
235F isn't any reason to get excited. You WANT temps to go above the boiling point of water in a production car, but not exceed it by a large margin.

Start worrying a little when they hit 260-270F.
well said

he also said he just switched to synthetic. who knows what kinda difference that would make in the fluid temp.

jeremy
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Old 06-15-2003, 03:10 PM   #9
JLMarx
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I actually didn't say that I just switched to synthetic... I have been using synthetic since the second oil change. But in any case, shouldn't switching to synthetic decrease oil temp, if anything?
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Old 06-15-2003, 09:34 PM   #10
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when I switched to syn oil my temps dropped a few degrees according to the guage. just alittle lower in regular driving
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Old 06-15-2003, 11:20 PM   #11
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Quote:
Originally posted by JLMarx
I realize that 235F isn't quite the "danger zone" yet, but to have it jump 40F in normal operating temp is something that definitely needs to be invetigated
More like seeing it jump from a little cold to normal. Is this your first summer with the gauge? Running the A/C? I don't think you have anything to be concerned about. I'd be more concerned if your oil temp never went above 212F. 235F is perfectly fine.
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Old 06-16-2003, 12:26 AM   #12
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For what it is worth-

I have run a few different Synthetic oils:

Redline 10 30 - Best one so far
Amsoil 5 30 - Runs hotter
Royal Purple 20 50 - No comment.

I am going with redline going forward..... BSR automotive will ship it by the case for those interested.

Peace out
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Old 06-16-2003, 09:23 AM   #13
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Quote:
Originally posted by Macabre


More like seeing it jump from a little cold to normal. Is this your first summer with the gauge? Running the A/C? I don't think you have anything to be concerned about. I'd be more concerned if your oil temp never went above 212F. 235F is perfectly fine.
This is interesting information, contradictory to everything else I have read. That is not to say that you aren't correct, but I have read that in normal city/highway driving I shouldn't see above 210F or so. If that is not the case, then at what temp should I start to get worried in normal driving conditions?

Also, as an update to my issue, yesterday I check the oil level and it was fine. I also looked for any anomolies in the cooling system and I couldn't find any. The coolant level was a little low, but still within the acceptable range. Interestingly, on my way to work this morning, the oil again heated up to about 220F, and then cooled back down to 200F, where it usually is. I'm not complaining, but I wonder what could have caused it to return to normal?
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Old 06-16-2003, 10:15 AM   #14
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Remember the oil temp is directly related to the outside air temperature. If you drive in the morning and it is cool and then drive in the afternoon on a 95 degree day you temps will definately increase.

I see this with my RX-7 and it has a thermostatically controlled big oil cooler.
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Old 06-16-2003, 11:24 AM   #15
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Rotorbaru, I understand that oil temp would be directly related to outisde air temp. However, there was no large change in weather conditions on that particular day that could have cuased such a spike in oil temp. Yes, the weather is warmer now than it was during the winter months, obviously, but it was not 40F warmer on Sat than it was on Fri. And for that matter, it is not 40F cooler today than it was this weekend. I don't think that it can be explained by simply citing weather conditions as a factor.
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Old 06-16-2003, 11:30 AM   #16
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If the weather/temperature conditions didn't change significantly then I agree with you that it probably isn't the reason.

I would try changing the oil filter only, it is cheap and easy to do. If nothing has changed recently except for the oil change that certainly be the first thing I would suspect. Luckily your temps are not dangerous but I would want to get an explaination to the sudden temp increase.
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Old 06-16-2003, 11:37 AM   #17
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interesting situation......does anyone know EXACTLY how the oil cooler in our car works?

i mean, i'm sure we know the basic....which is that, the coolant is what help carry the heat away from the oil.

wonder if there's something wrong w/the way the heat is being exhanged there?
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Old 06-16-2003, 12:03 PM   #18
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Quote:
Originally posted by JLMarx

This is interesting information, contradictory to everything else I have read. That is not to say that you aren't correct, but I have read that in normal city/highway driving I shouldn't see above 210F or so. If that is not the case, then at what temp should I start to get worried in normal driving conditions?
212F is generally considered "normal" and it's also the temperature oil is heated to when the warm viscosity is measured. The purpose being to boil off the condensation that forms in the engine oil. Water in the oil creates acids which are a primary cause of reduced oil service life.

Oil cooler looks like this:

You can see the oil cooler is just the filter mount. Coolant circulates through the housing to perform the cooling functions. Coolant is also used to help bring the oil up to temperature since it warms up more quickly. Obviously this means you'll never see oil temps lower than coolant temps after the car is warmed up.

Where is your oil temp sender installed, btw?

Last edited by Macabre; 06-16-2003 at 12:09 PM.
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Old 06-16-2003, 02:15 PM   #19
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Thanks guys, I'm getting some good info here

Macabre, my oil temp sender is in the plug on the top of the engine block, kind of under the IC.
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Old 06-16-2003, 04:26 PM   #20
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that is why your temps are too high.. the oil temp reading should be taken in the oil pan.. where the oil is not under pressure..

that plug at the top is for oil pressure reading .. and reading temp under pressure will cause higher readings.
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