Author Topic: High oil temp  (Read 832 times)

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Hic

  • Posts: 191
High oil temp
« on: Sep 30, 17, 23:55 »
The oil temp gauge on my 1.6td shows upwards of 120C. The upper rad hose is hot but the lower one is only warm (not cold). Is this more likely a bad thermostat (stuck closed/halfway closed?) or air in the lines?

Thanks

Hic

  • Posts: 191
Re: High oil temp
« Reply #1 on: Oct 01, 17, 03:06 »
Perhaps the oil temp gauge is reading too high? I've only just installed it.

I drove from Coquitlam to Richmond and the lower rad hose got warm, but not hot. The gauge was stabilizing at around 120C.

On the way back from Richmond to Coquitlam, I managed to keep the reading on the oil temp gauge around 100C with a lot of pulse and glide and engine off coasting. When I arrived in Coquitlam, the lower rad hose was cold.

Do these engines take a long time to build up heat, or is my oil temp gauge reading too high, or am I having air/blockage in the cooling system, or faulty thermostat?

Arbor

  • Posts: 97
Re: High oil temp
« Reply #2 on: Oct 01, 17, 23:27 »
120 is a good temp for oil imo, what weight oil are you running? Where Are you reading oil temp from?? That can have a big effect on readings. What oil pressure do you have at at that temp?

Autohau5

  • Posts: 6748
  • Gasoline rainbow in the gutter
Re: High oil temp
« Reply #3 on: Oct 02, 17, 07:19 »
120 is pretty damn high. my mk7 R rarely goes past 100, and my mk1 16vG60 rarely goes past 95.
'01 A6 2.7TT 6MT  |  '81 Rabbit S 16VG60   |  '15 Touareg TDI R-Line   |    '04 Touareg V10 TDI    |   '96 YZF750R

Hic

  • Posts: 191
Re: High oil temp
« Reply #4 on: Oct 02, 17, 19:27 »
A drive from Coquitlam to BCIT and the lower rad hose is cold, oil temp read around 115-120 and stabilized. I am reading it off an aftermarket sensor and gauge. The sensor is located at the drain plug.

Hic

  • Posts: 191
Re: High oil temp
« Reply #5 on: Oct 02, 17, 19:28 »
I'm running 15w40, I don't have oil pressure gauge.

Autohau5

  • Posts: 6748
  • Gasoline rainbow in the gutter
Re: High oil temp
« Reply #6 on: Oct 02, 17, 21:29 »
Driving from coquitlam to BCIT should get the engine warm enough to have the thermostat open and heat up the lower rad hose. I say change your thermostat. Or your water pump is weak.
'01 A6 2.7TT 6MT  |  '81 Rabbit S 16VG60   |  '15 Touareg TDI R-Line   |    '04 Touareg V10 TDI    |   '96 YZF750R

Arbor

  • Posts: 97
Re: High oil temp
« Reply #7 on: Oct 03, 17, 00:15 »
It really does depend on where you reading the temp from though. If your reading from the pan it can be 15-20c lower in temp than it would be say off the head.

I trouble shooted a oil temp issue at the start of this year, which ended up being a bad ground, but I bought an oil cooler because my temp gauge was reading 150c+ and now it only ever gets to 85c, which is too cold for optimal efficiency. 

Id install a oil pressure gauge and see what kinda of pressure you have at 120C.....Hot oil makes for more HP and less friction = smiles and better fuel economy ;)



« Last Edit: Oct 03, 17, 00:16 by Arbor »

Hic

  • Posts: 191
Re: High oil temp
« Reply #8 on: Oct 03, 17, 21:57 »
It really does depend on where you reading the temp from though. If your reading from the pan it can be 15-20c lower in temp than it would be say off the head.

I trouble shooted a oil temp issue at the start of this year, which ended up being a bad ground, but I bought an oil cooler because my temp gauge was reading 150c+ and now it only ever gets to 85c, which is too cold for optimal efficiency. 

Id install a oil pressure gauge and see what kinda of pressure you have at 120C.....Hot oil makes for more HP and less friction = smiles and better fuel economy ;)

So...on the same drive today, it dropped from 105 to 80 out of the blue, so I got out after a bit and checked the lower rad hose, it was finally hot. So...the thermostat didn't open before at 120 but now it did at 105? The lower rad hose is usually cold at 100-120, but today it finally got hot and temps dropped to 80-85 after opening.

Is the thermostat stuck occasionally? (Can this happen, or is it likely to?)

Or is it air in the lines... or bad water pump?

Could something clogged in the lines cause this?

I hope it is not thermostat/water pump because I hate doing the v belt on these cars...

Arbor

  • Posts: 97
Re: High oil temp
« Reply #9 on: Oct 03, 17, 22:09 »
Totally possible to be one of those things, thermostats do go bad, I had one get stuck open once.
Unless you have leak in the cooling system or done work to the cooling system recently I would find it weird for it to be a air pocket.

Keep us posted  :thumbup:
 

Hic

  • Posts: 191
Re: High oil temp
« Reply #10 on: Oct 04, 17, 19:45 »
Totally possible to be one of those things, thermostats do go bad, I had one get stuck open once.
Unless you have leak in the cooling system or done work to the cooling system recently I would find it weird for it to be a air pocket.

Keep us posted  :thumbup:

Yeah I've heard of stuck open often but not sure on closed. It has been luke warm recently instead of cold on the lower rad hose.

Hic

  • Posts: 191
Re: High oil temp
« Reply #11 on: Oct 05, 17, 21:07 »
So I'm fairly sure it's a bad water pump, the coolant flow is extremely weak when I popped off the coolant bottle cap to look inside.  There's barely any flow going through the system. I don't think it's due to a blockage or clogs in the system because gentle squeezes on the lower rad hose caused significant movement within the bottle. At this point, I think it's either air in the system or weak pump...leaning heavily towards the latter though.

Autohau5

  • Posts: 6748
  • Gasoline rainbow in the gutter
Re: High oil temp
« Reply #12 on: Oct 05, 17, 21:31 »
Do you have good heater output, or is it weak too?
'01 A6 2.7TT 6MT  |  '81 Rabbit S 16VG60   |  '15 Touareg TDI R-Line   |    '04 Touareg V10 TDI    |   '96 YZF750R

Hic

  • Posts: 191
Re: High oil temp
« Reply #13 on: Oct 06, 17, 14:49 »
Heater is warm/hot, but nowhere as hot as my vr6.

Hic

  • Posts: 191
Re: High oil temp
« Reply #14 on: Oct 06, 17, 14:50 »
When the oil temp is up in the 120s, the heater feels sufficiently hot (feels uncomfortable if I keep my hand in front of the vents for too long).

Hic

  • Posts: 191
Re: High oil temp
« Reply #15 on: Oct 06, 17, 14:52 »
If someone local is free and would like to take a look and give diagnostics opinions, I can drive over   :)