Tegger's real-world oil consumption

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Tegger wrote:


http://www.astm.org/Standards/D5800.htm
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Quote from above link: "Evaporation may contribute to oil consumption in an engine and can lead to a change in the properties of an oil. Many engine manufacturers specify a maximum allowable evaporation loss."
My point exactly. Oil is designed /not/ to evaporate. Evaporation causes oil consumption, so it is carefully controlled. The amount lost to evaporation is -- by design -- not detectable on a dipstick.
--
Tegger

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On 06/09/2010 02:33 PM, Tegger wrote:

so what is 9% of 4.5 quarts? how many quarts from "top" to "bottom" on the stick?
--
nomina rutrum rutrum

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Boil away, vaporize, volatilize - call it what you will, some of your oil disappears over time becasue it is heated to high temperatures. There are tests to evaluate the extent to which this happens. Go to the Mobil 1 Website and read what they have to say about volatility. They claim low volatility, not NO volatility.
I hate to use anything connected with Amsoil as a reference, but I will this time - http://www.bestsynthetic.com/volatility.shtml . From this reference:
"In the NOACK Volatility Test the oil is heated to 150C for a specified period. Lighter oil fractions will "boil off," leading to oil consumption, oil thickening and a loss of performance. The percentage lost, by weight, due to this "boil-off" is reported."
As an example, the NOACK for Mobil 1 5W30 is around 9%. This means if you heat the oil to 150 C you will lose around 9% of the oil through vaporization. 150 C is very hot (300 F) and your oil should not get that hot, but some volatizes at lower temperatures (hopefully nothing like 9% or even 3%).
Ed
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