Synthetic Oil and Holding Capacity: Diesel Fuel Lubrication Engine Additives  -- Tractor Maintenance Discussion Forum and Review Synthetic Oil and Holding Capacity: Diesel Fuel Lubrication Engine Additives -- Tractor Maintenance Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Diesel Fuel Lubrication Engine Additives Forum

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 07-04-2003, 09:04 Post: 58835
Peters

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 Synthetic Oil and Holding Capacity

We have had a number of discussions on synthetic oil and its superior lubrication. A few members stated that they had repaired gas engines that were using synthetic and there was a marked difference in the wear in the engine.

I have seen as have others that the oil stays cleaner than conventional oil. Members have seen the oil clean at the change interval with newer diesel engines. We assume this is primarily due to less breakdown of the oil, but the other source for contaminates, combustion is marketly more dirty than with gas.

Has anyone here broken down a diesel engine running with synthetic? I guess I am concerned that the synthetic may have less particle holding capacity do to the fact that the base stock is highly hydrophobic. Ie the oil may be clean but the oil journals maybe dirty. I would assume that they use a better surfactant to help keep the particles in suspension but you don't know unless you rip one appart. I am not inclined to rip appart my new engine.






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 07-06-2003, 09:11 Post: 58957
Peters

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 Synthetic Oil and Holding Capacity

Tom; the detergent in oils emmusifies water but it is not added to oil for that but to increase the holding capacity of the oil. To increase the ability of the oil to suspend dirt. One of the biggest differences between a diesel certified oil "C" and a gas engin oil "F" is the detergent package.
Water absorbed into the oil is one reason that it is good to have the engine fully heated before it is shut off. In cool damp climates (or boats) you can see the oil froth at the breather etc. You need to drive the water that has condensated out of the system.
You are right an electric motor should not use a detergent oil. They do not heat up enough to drive off the water vapor. I have made that mistake before. Any other equipment that does not heat up enough should also be the same way, air compressors, sewing machines etc.
Most of the older gas engines I rebuild were run with leaded gas. Maybe the sludge build up was due to the lead and not normal old age. I have rebuilt a few head since but they were not as old. Certainly they looked cleaner. Better oils and no lead certainly make a difference.
I guess the question then comes down to is the heavy dark soot in the used diesel oil, break down of the oil rather than combustion products?






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 07-07-2003, 21:29 Post: 59090
Peters

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 Synthetic Oil and Holding Capacity

When you think of polymer material in general like attacts like material. Oils are oligomeric (small chain polymers) and therefore the same principle applies.

Synthetic oils are essentually short chain polyethylenes. Diesel and gas are complex mixtures of aromatics, unsaturated and saturated hydrocarbons. Naturally mineral oils are a mixture of aromatic and aliphatic oligomers.

Detergents are materials with hydrophobic and hydrophilic functions. They do not just emusify the oil but also suspend dirt particles in the oil. When you stop stirring the oil with out the detergent in the oil the dirt will drop out into your pan.

I recently helped a friend's son replace his oil pump on his truck. I was suprised at how clean the pan was despite having nearly 120,000 miles.






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Discussion Boards > Active Subjects > Messages as Posted > Diesel Fuel Lubrication Engine Additives Forum

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