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  #1  
Old 11-01-2009, 10:06 PM
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Default oil temp fluctuating

my oil temp has always fluctuated pretty wildly...i want to replace the sensor, but i don't see any mention of it in the bentley book. i've searched and found different answers, mainly because they've been different models.

I've got 2000 A6 2.8L avant

Q - i've read the oil level sensor and oil temp is combined into the same sensor. but i see at ECS tuning, for example, has the level sensor but makes no mention of it being a temperature sensor too?

anyone know what the deal is?
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Old 11-01-2009, 10:13 PM
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oil temps do fluctuate quite a bit. When you are at operating temp, how much does it change?
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Old 11-01-2009, 10:44 PM
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i don't pay too much attention to it anymore but around the midway mark for the most part, then i notice it'll go up to like 325 for awhile, then from there it may drop down rapidly to 175 (in like 3-4 seconds).
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Old 11-01-2009, 10:44 PM
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you don't know where the sensor is though?
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Old 11-01-2009, 10:52 PM
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Quote:
Originally Posted by jchaffee1 View Post
you don't know where the sensor is though?
nope, sorry.

http://forums.audiworld.com/showthread.php?t=2763857
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Last edited by Jeffla; 11-01-2009 at 10:54 PM.
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Old 11-02-2009, 10:32 AM
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christ...just did my timing belt and didn't even notice it. it seems weird that when i search around i can't find a new sensor sold anywhere...maybe they never fail, and my oil is really that hot?? I don't know what would cause extreme fluctuations like that....only thing i can think of is if there is a pretty major clog in there and that it only gets dislodged once it gets super hot, then new cooler oil flows in, clogs and repeats?? guess i could try to seafoam it, don't want to damage any seals though.

Last edited by jchaffee1; 11-02-2009 at 10:39 AM. Reason: added stuff
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Old 11-02-2009, 10:44 AM
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this is another link i found

http://forums.vwvortex.com/zerothread?id=4604532
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Old 11-03-2009, 12:21 PM
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My 2.7 does the same fluctuating in OIL temperature. Does anyone recommend changing the oil level sensor? Is it confirmed that, that is where the temperature is sent from? Is it something faulty or a normal condition?

If faulty it seems like an inexpensive fix...

http://cgi.ebay.com/ebaymotors/Audi-...item518c3249e5
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Old 11-03-2009, 07:02 PM
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Quote:
Originally Posted by Audi 2000 a6 2.7T View Post
My 2.7 does the same fluctuating in OIL temperature. Does anyone recommend changing the oil level sensor? Is it confirmed that, that is where the temperature is sent from? Is it something faulty or a normal condition?

If faulty it seems like an inexpensive fix...

http://cgi.ebay.com/ebaymotors/Audi-...item518c3249e5

That sure is cheap! However, I had bad experiences with ebay electrical parts... Not saying that it is bad, but just being a pessimist.
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Old 11-03-2009, 11:42 PM
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The temperature sensor doubles as the oil level sensor on the bottom of the oil pan. The sender located on the oil cooler is the oil pressure sensor. However on earlier models the temperature is read from the pressure sensor. So if one sensor doesn't fix it, replace the other one. Its easier to get at the one on the bottom of the oil pan so thats the one i would try first.
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Old 11-04-2009, 08:28 AM
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Thanks for the info.
SO you think it is something i need to change? The highest oil Temp ive seen is 200'F, but the normal range is 100-125'F. No Dash lights are on to say there is a problem.
Ive just changed the ABS module, coolant sensor, timing belt, fuel filter, air filter, and the DVs. My funds are starting to run low, is this something that needs to be changed immediately, or can it wait a few weeks? Am i taking a risk by waiting?
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Old 11-04-2009, 10:21 AM
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doubt it...your temps aren't even high. mine have been fluctuating like that forever and they go up to 325.
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Old 11-16-2009, 04:38 PM
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so i've been paying more attention to the oil temp recently and not getting the big fluctuations so much as before. but, the oil temp is basically really hot all the time, 325 showing on the gauge.

Question - what would cause such a high temp?

I think my O2 sensors are about shot again too, haven't had the best luck with the cheapy ebay universals...oh well. If the car defaults to not using the sensors for mixture management would that cause higher or lower engine temps?
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Old 11-16-2009, 09:52 PM
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Quote:
Originally Posted by jchaffee1 View Post
so i've been paying more attention to the oil temp recently and not getting the big fluctuations so much as before. but, the oil temp is basically really hot all the time, 325 showing on the gauge.

Question - what would cause such a high temp?

I think my O2 sensors are about shot again too, haven't had the best luck with the cheapy ebay universals...oh well. If the car defaults to not using the sensors for mixture management would that cause higher or lower engine temps?
I don't think 325 is accurate. If your engine was consistently that hot, you would be overheating the engine. You would be smelling hot metal often. Something has to be causing your inaccurate readings. Bad ground, bad cluster?
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Old 11-17-2009, 01:48 PM
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If I would be in that predicament, I would definitely replace the switch for peace of mind.
The price for one that fits my C4 is, based on various pressure range, between $ 3.14 -$ 5.50 (ArizAutohaus) and $ 5.99 at AutoZone.
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Old 11-17-2009, 03:44 PM
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i always assumed/hoped that it was inaccurate...figured the coolant temp would fluctuate too if it was that hot, but it stays rock solid at exactly midrange when the car is up to temp.

I think i'll replace the oil level sensor at the bottom of the pan when i do my next oil change and see if that does anyting.
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Old 11-18-2009, 11:40 AM
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For your reference, my 2.8 oil temp usually sits between 200 and 225. If I am really pushing with full load, it sometimes goes up to a bit shy of 250. With that said, I don't think your oil temp is really at 325 considering that the coolant temp is right where it is supposed to be. So as you originally thought, I suspect gauge or sender issue.
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  #18  
Old 11-18-2009, 11:41 AM
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Quote:
Originally Posted by Audi 2000 a6 2.7T View Post
Thanks for the info.
SO you think it is something i need to change? The highest oil Temp ive seen is 200'F, but the normal range is 100-125'F. No Dash lights are on to say there is a problem.
Ive just changed the ABS module, coolant sensor, timing belt, fuel filter, air filter, and the DVs. My funds are starting to run low, is this something that needs to be changed immediately, or can it wait a few weeks? Am i taking a risk by waiting?

That oil temp seems really low. Does your water temperature gauge fluctuate?
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