Temp of Oil as shown on the MFD

[Tigger]

Hey all,
I have noticed that my oil temp as shown in Celcius degress on the MFD varies quite a bit.

My Tiguan (same motor EA88 never showed any higher than 100C, yet my RS can show from 93C anywhere to 105C, as it did today...

It doesnt affect anything, but just seems strange....

[candy_wagon]

I agree. Most of the time its around 102 degrees, but I have seen it as high as 106 - and I wasn't even pushing it!

[Tigger]

Yep...strange...
either the sensor / thermostat is more sensitive on the Octavias, or the Tiguan one was not sensitive enough??

I wonder what temp would be too high and worth being concerned about??

[Diesel_vert]

I wonder what temp would be too high...

Most modern cars that I've seen with oil temperature gauges allow the oil temperature to reach 140-150°C before the vehicle warns you of a high oil temperature.

We know there's no inherent danger in revving the engine, or even cruising at, very high RPMs as it's part of the design brief - so long as you don't go beyond the redline.

Similarly, there is no inherent danger in allowing oil temperatures to reach very high because it's part of the design brief (for both the engine and the oil) - so long as you don't exceed the temperature warning threshold or skimp on oil.

Obviously, if the engine is likely to experience high oil temperatures for an extended period of time (frequent towing, track days, racing, etc) then it would be smart to deal with that by fitting axillary oil coolers and such.

However, in the same way that keeping the engine revs down would aid in its longevity, so will keeping the oil temperature down (but not too low, as you want it to be hot enough to deal with moisture, fuel dilution, etc - short trips are much more likely to kill the engine rather than high oil temps).

... and worth being concerned about?

Not unless something is malfunctioning on the engine.

Storm in a teacup.

[zei20t]

modern engines run much higher than 'older' ones. my last few cars have had water temps 90-100 and oil temps around the same. except when I give it the boot

[Mysticality]

The Water temp gauge on the dashboard is very quick to act... When the water temp is 90 and the oil temp is 50, the actual water temp is around 70^C.

The highest oil temp I've seen my diesel cruise at is 105, the lowest cruise (more than 10min) is 89. Highest I've ever seen it at is 112, but that was after some extreme driving up a huge hill.

I have water temps from 89-94^C. (OBD-II scanner)

Usually the water is at 89 and the oil is at 94-100.

[Martin]

modern engines run much higher than 'older' ones. my last few cars have had water temps 90-100

Agreed, modern engines are putting out a lot more power per litre which results in a lot more heat
After a journey on a hot day you can pop the bonnet and find it's unconfortable to leave your hand on the shock tower

The water should stay around 90 - can't have it reaching 100

[Martin]

Apparently it's ok up to 115 (I would not want to see it that high)

Most of the time mine is around 95~98
Pushing hard I've had it up to 104

One thing I have noticed, it's slow to warm up or react
The water can be 90 deg and the oil is only 50 deg - I doubt that is correct

[zei20t]

no, that is correct. oil takes longer to warm up than water. which is why you should wait for 10-15 mins of warmup before you start hammering the car.

anyone been on the track? id like to hear what oil and water temps people are seeing

[wai]

Last Friday I drove from Bendigo to Sydney. Ambient temperature was up to 39.5 deg C. The oil temperature was up to 112 deg C, with it mainly being around 105 to 107 deg C. This was with sustained speeds up to 110 km/h. Around town it is around 102 to 105 deg C.