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Charles
Dodge Dakota
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8/31/2003
16:49:59
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 Subject: Oil degradation
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Message:
Oil degradation
I read a report where about a test that shows that oil degrades much faster when running it a quart low in the crankcase. I do not have any other information from the test other than the blurb below. Draw whatever conclusions from it that you want to. My concern is that my old Dak needs a quart quite often and how much damage am I doing to the engine?
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Top-Up Demonstration
We have run a program to compare the rate of oil degradation when the car is run at near
maximum versus near minimum dipstick oil level. It has shown conclusively that when run at the near minimum mark, the oil degrades at a significantly higher rate compared to the near maximum level. The measured degradation was most significant in respect of wear protection, HTHS viscosity (fuel economy impact) and low temperature, CCS, viscosity (start up).
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Can someone explain this to me and explain why I keep having to add oil all the time.
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EBL
Dodge Dakota
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8/31/2003
19:11:13
| RE: Oil degradation
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Message:
The loss of oil is a rather easy one: You are either leaking it or burning it. Since you did not mention a puddle of oil under your truck, I guess you are burning it. Do a search on piston rings and valve seals.
If you have a smaller amount of oil in your engine, the smaller amount has to work harder. Lets say you have a paper company and have to cut down 10 acres of trees. Will you work harder if you cut them down yourself or if you hire a few buddys to help share the labor? THe more oil your pan holds the less work any oil molecule will have to do. (don't overfill your pan please do a search on windage and crank scrapers)
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AmsoilSponsor
DakotaEnthusiast
9/01/2003
13:55:35
|  Amsoil Synthetic Motor Oil --- Re: Oil Degradation
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Message:
Charles,
This is exactly why you should never let your oil level get to the "add one quart" mark, you should always be topping it off as soon as it's even the tiniest bit off the full mark. I like to add 100-200ml at a time as it needs it. It simply makes no sense whatsoever to wait until it's a full quart low in order to add oil. There is zero benefit in doing that, and like this article says, there is proof that this practice is harmful.
Don't forget there are other things that degrade oil ... moisture, dirt, metal products, combustion products, depletion of additives, shearing. Heat is only part of the puzzle. Synthetics are also better at resisting degredation through the heating process. For instance the 'Vette was able to dispense with an oil cooler by specifying a synthetic oil.
And ... it its no great mystery why running a half a quart to one quart low would cause it to degrade sooner. If you have 25% less oil to work with the other oil will wear out proportionately sooner because less oil is doing the work. A lot of what gets mentioned in articles is not rocket science.
It scares the heck out of me when I pull someone's dipstick and the oil is just a mere tick on the tip, not even up the stick at all. Keep your oil topped up folks!
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