3 months' oil change
09-17-2005, 12:38 PM
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Over time, the molecules that make up the genetic disposition of the general properties of automotive grade motor oil tend to oxidize, thus causing degration, which in turn, reduce's the ability to protect the moving part's of an engine.
When the oil degrade's, this cause's thermal despansion, which affected by atmospheric pressure can attribute to molecular disfunction of the overall genetic mutation.
Certain brand's of motor oil react differently to these molecular disfuntion's. In recent studies, some brand's have shown to have a progressive molecular disfunction, while other's have been shown to react in a linear fashion.
More recently, studies have shown that some motor oil has reaction's in which the cause is unknown during a full moon. We still have a long way to go baby.
When the oil degrade's, this cause's thermal despansion, which affected by atmospheric pressure can attribute to molecular disfunction of the overall genetic mutation.
Certain brand's of motor oil react differently to these molecular disfuntion's. In recent studies, some brand's have shown to have a progressive molecular disfunction, while other's have been shown to react in a linear fashion.
More recently, studies have shown that some motor oil has reaction's in which the cause is unknown during a full moon. We still have a long way to go baby.
09-19-2005, 05:27 AM
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You have a time limit on your oil because of oxidation.
In short oxidation is this: "oil can be oxidized which terminates the free radical reactions that happen that allow it to suspend carbon and disperse it" ~ friend at Lubrizol
After a certain amount of oxidation occurs, the Ph of the oil also falls to make it acidic, this can deteriorate many different things such as most rubbers; included in the Ph change is the loose of the ability to suspend the carbon particles causing sludge build up. Places (like Ohio) that have higher sulfur fuels should be concerned about this problem. I live in Ohio, and am aware the sulfur in my fuel is probably higher than most areas, so I do not go longer than 10 months on a quality synthetic. I also have some simple Ph paper to test the oil every now and then, you can get this stuff cheap.
The 3 month oil change went out the window with the 3,000 mile oil change. Those numbers held very true before the advent of quality additives. However today we have detergents like zinc dithiophosphates, hindered phenols, aromatic amines and sulfurized phenols, oil can do much longer.
Mineral (dino) oil can go about 6 months before it starts to loose it these properties and synthetics can go about a year. Oxidation will also kill some of the oil, since a full synthetic has a uniform size distribution (every oil particle is the same size) loosing a few particles of oil will not hurt much, because the viscosity properties will be the same (viscosity is partially based on overall particle size). However, if you look at the dino oil, the particles are with in a range, some are smaller than the average and some are larger than the average. The smallest particles are the most likely to be burned/oxidized, hence leaving larger particles behind. This means there are now more larger particles than smaller particles, hence the oil has become thicker.
All of the above play into why need to change your oil. And while I and the manufactures can give you guide lines, you should figure out when your oil needs changed. Generally speaking the better quality oil you use, the longer it can last.
Hope this helps you guys out!
In short oxidation is this: "oil can be oxidized which terminates the free radical reactions that happen that allow it to suspend carbon and disperse it" ~ friend at Lubrizol
After a certain amount of oxidation occurs, the Ph of the oil also falls to make it acidic, this can deteriorate many different things such as most rubbers; included in the Ph change is the loose of the ability to suspend the carbon particles causing sludge build up. Places (like Ohio) that have higher sulfur fuels should be concerned about this problem. I live in Ohio, and am aware the sulfur in my fuel is probably higher than most areas, so I do not go longer than 10 months on a quality synthetic. I also have some simple Ph paper to test the oil every now and then, you can get this stuff cheap.
The 3 month oil change went out the window with the 3,000 mile oil change. Those numbers held very true before the advent of quality additives. However today we have detergents like zinc dithiophosphates, hindered phenols, aromatic amines and sulfurized phenols, oil can do much longer.
Mineral (dino) oil can go about 6 months before it starts to loose it these properties and synthetics can go about a year. Oxidation will also kill some of the oil, since a full synthetic has a uniform size distribution (every oil particle is the same size) loosing a few particles of oil will not hurt much, because the viscosity properties will be the same (viscosity is partially based on overall particle size). However, if you look at the dino oil, the particles are with in a range, some are smaller than the average and some are larger than the average. The smallest particles are the most likely to be burned/oxidized, hence leaving larger particles behind. This means there are now more larger particles than smaller particles, hence the oil has become thicker.
All of the above play into why need to change your oil. And while I and the manufactures can give you guide lines, you should figure out when your oil needs changed. Generally speaking the better quality oil you use, the longer it can last.
Hope this helps you guys out!
09-19-2005, 08:23 AM
#15
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Originally Posted by mbilderback,Sep 16 2005, 04:24 PM
Ok, and the whys?
09-19-2005, 10:58 PM
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