dexos1

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Originally Posted By: dave1251
To piggyback Volk06. At operating temperatures ambient temperatures are not really a factor to consider. Ambient temperatures have the largest effects on oil before and after engine shut off. Meaning like yesterday the 116F temperature here kept the oil temperatures in the sump from cooling down after engine shut off and before engine start the oil was less viscus than it would be at 0F. That being said the operating temperature of the oil really was not much higher than in a winter conditions where is it 20F outside something like 10-15F. It takes longer for the oil to cool down when it is hot outside but it also take less time for the oil to reach operating temperatures to. Like much in life there are trade offs.




Jeez it gets hot out there.
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Originally Posted By: volk06
Originally Posted By: Gabe
Originally Posted By: dparm


And ambient temps have almost nothing to do with oil temps. These are not air cooled cars.


Of course outside air temperature influence oil temperatures.
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For the most part he's right, warm ambient temperatures have little effect on oil temperature at operating conditions.


Why is that?? It seems like in the winter time the oil will be cooled significantly more between each pass through the engine.
 
Originally Posted By: lexus114
Originally Posted By: dave1251
To piggyback Volk06. At operating temperatures ambient temperatures are not really a factor to consider. Ambient temperatures have the largest effects on oil before and after engine shut off. Meaning like yesterday the 116F temperature here kept the oil temperatures in the sump from cooling down after engine shut off and before engine start the oil was less viscus than it would be at 0F. That being said the operating temperature of the oil really was not much higher than in a winter conditions where is it 20F outside something like 10-15F. It takes longer for the oil to cool down when it is hot outside but it also take less time for the oil to reach operating temperatures to. Like much in life there are trade offs.




Jeez it gets hot out there.
eek.gif



Yeah it was still over 100F at 1AM. I have spend a good deal of my life in extreme climates and the vast majority of the time I do not let the weather affect my mood. But yesterday evening I was not in a good mood at all.
 
Originally Posted By: Gabe
Originally Posted By: volk06
Originally Posted By: Gabe
Originally Posted By: dparm


And ambient temps have almost nothing to do with oil temps. These are not air cooled cars.


Of course outside air temperature influence oil temperatures.
06.gif



For the most part he's right, warm ambient temperatures have little effect on oil temperature at operating conditions.



Why is that?? It seems like in the winter time the oil will be cooled significantly more between each pass through the engine.


Under this scenario the oil is cooled faster but while the engine is in operation once operating temperature is reached and until shut down oil is circulating thru the engine the rate of cooling is not enough to overcome rate of the engine heating the oil.
 
Originally Posted By: Bgallagher
Originally Posted By: lexus114
Originally Posted By: Bgallagher
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Waiting for the DEXOS arguments to start.



Ooooh. Got ya.
 
Originally Posted By: Gabe

Why is that?? It seems like in the winter time the oil will be cooled significantly more between each pass through the engine.


If the engine cooled at all because of cooler oil entering it from the sump, the cooling system thermostat would close further (or close altogether). This keeps the engine operating temperature (and therefore, engine oil temperature) regulated the same regardless of ambient temperature.

Put another way, any increased loss of heat through the oil pan is made up for by a reduction in the amount of heat loss through the radiator (thanks to the thermostat).
 
It's more stringent for turbo engines than SN or GF-5, so it's a good oil to run in a turbo car. Like most of GM's lineup is going to be shortly.

You guys realize that you would have bashed GM for pricey oil changes if they had released scads of turbo'd cars, and then spec'd 5w-40 synthetic oil for them that wasn't available everywhere. At least at the consumer level, dexos1 compatible oil is still fairly affordable, and can be found almost anywhere.
 
But will they decide to give us DexOS 3 5w40 oil for turbocharged, high performance, and Corvette engines in 2018? I'm inclined to expect that if they ever move beyond 5w30 it'll be to a 0w30.
 
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Originally Posted By: yonyon
But will they decide to give us DexOS 3 5w40 oil for turbocharged, high performance, and Corvette engines in 2018? I'm inclined to expect that if they ever move beyond 5w30 it'll be to a 0w30.


IIRC there is a 0w-30 and a 0w-20 on the dexos1 list. I'd love to find those, specifically the 0w-20.

I bet that GM would put a 5w-40 onto the dexos1 list just to simplify things.
 
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