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The mkiv Supra Owners Club

Increased oil temperatures?


James
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It used to be that when I was driving sensibly or idling, my oil temperature gauge would read at 80°C. Lately it has sat at 90°C under the same circumstances.

 

I initially figured that this may have been down to the oil being older and requiring replacing. I changed the oil and filter and this didn't seem to change anything temperature-wise.

 

The operating temp on a run has obviously increased as well - 90°C previously is now just shy of 100°C etc.

 

What other things could cause this to occur? I haven't changed my coolant in quite a well but the level is sitting fine and the temperature is where it always has been (according to the OEM gauge, I presume around 90°C when in the centre of the scale?).

 

The only thing I wonder is if it is anything to do with my current lack of fan shroud or due to a heater matrix replacement (for a demisterman item). I am slightly unsure though, given the coolant temperature hasn't been affected?

 

Any ideas?

 

Thanks :)

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First off 80c is too low anyway, oil needs to get too 100c in order to evaporate any water vapor and any other compounds that develop in the engine, as a result of the combustion process. i would be aiming at having the normal engine running temps even with an oil filter at around 100c.

Where will the water evaporate to? It's a sealed system?

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That's cool if 80 is too low, as it hasn't been that for a long time! I was just curious as I was under the impression that 80 would have been normal given that was how the car ran from time of purchase. If not then that is fine :)

 

After a serious blast it normally sits a little over 100. 105 maybe. Depends how long hard driving is sustained for really!

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