Some VMs are not compatible with some POEs. This usually shows when the oil is cold, which is why ALL formulations, whether they contain POEs or not, should be tested for compatibility of the ingredients. This should involve cold/hot cycling and long term cold storage.
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Informacje na temat estrow oraz ogolna wiedza - Na pytania odpowie Thomas Schaefer (TomNJ)
Hard to say as it depends on what ester and VM are used. I have seen this once before, and that formulation had a base oil that was 50% esters (three different kinds) and 50% PAO. It occurred after cold storage, and after changing to a different VM the problem went away.
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Sojabohnenoel, Methylester | 67784-80-9
Visit ChemicalBook To find more Sojabohnenoel, Methylester(67784-80-9) information like chemical properties,Structure,melting point,boiling point,density,molecular formula,molecular weight, physical properties,toxicity information,customs codes. You can also browse global...
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Do you know this ester?
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I found him here: http://www.bgfleming.com/SDS/103.pdf
What is your opinion on this type of oils? You can also see quite a bit of low viscosity mineral oil, which would make sense in theory to wash the engine. Overall this mixture can have a nice aniline point and a Kauri-Butanol value.
What is your opinion on this type of oils? You can also see quite a bit of low viscosity mineral oil, which would make sense in theory to wash the engine. Overall this mixture can have a nice aniline point and a Kauri-Butanol value.
The oxidation value by FTIR does not directly measure ester base oil content, it measures carbonyl bonds, C = O. Ester base oils contain C = O bonds, but so do some of the additives.
If the oxidation value of an oil is significantly higher than the average conventional oil it usually indicates the presence of some ester base oil content, but how much is difficult to say without knowing which ester is being used. Ester base oils used in motor oils may contain one, two, three, four, six or more C = O containing ester linkages, so to calibrate the oxidation value against the ester content you need to know which ester (s) are being used and the effect of the additive system. Best you can say is the higher the oxidation value above an average conventional non-ester oil, the higher the ester base oil content is likely to be, but assigning a percentage without composition information and calibration is just a guess.
An ester content of around 5-15% is enough to provide additive solubility and seal conditioning, and more will kick in some cleaning capability and lubricity, but too much can adversely affect seals. Exact numbers depend on which esters and other balancing base oils and additives are used.
If the oxidation value of an oil is significantly higher than the average conventional oil it usually indicates the presence of some ester base oil content, but how much is difficult to say without knowing which ester is being used. Ester base oils used in motor oils may contain one, two, three, four, six or more C = O containing ester linkages, so to calibrate the oxidation value against the ester content you need to know which ester (s) are being used and the effect of the additive system. Best you can say is the higher the oxidation value above an average conventional non-ester oil, the higher the ester base oil content is likely to be, but assigning a percentage without composition information and calibration is just a guess.
An ester content of around 5-15% is enough to provide additive solubility and seal conditioning, and more will kick in some cleaning capability and lubricity, but too much can adversely affect seals. Exact numbers depend on which esters and other balancing base oils and additives are used.
Limonka
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Hello @TomNJ
So that's why we should have some important knownledge about the manufacturer from which we would like to bought fully synthetic motor oil.
This question probably will be connected with a bit older cars and youngtimers.
I would like to ask you about the HTHS. Oils in the same viscosity and ACEA class have different values of this parameter. As I saw some of them have HTHS 3.5 mPas, some 3.9 mPas and other over 4 mPas up to even 4.5 ! Should be worry about this value ? Does higher values can cause faster wear of the engine or maybe guarantee better protection in more demanding use cases ?
So that's why we should have some important knownledge about the manufacturer from which we would like to bought fully synthetic motor oil.
This question probably will be connected with a bit older cars and youngtimers.
I would like to ask you about the HTHS. Oils in the same viscosity and ACEA class have different values of this parameter. As I saw some of them have HTHS 3.5 mPas, some 3.9 mPas and other over 4 mPas up to even 4.5 ! Should be worry about this value ? Does higher values can cause faster wear of the engine or maybe guarantee better protection in more demanding use cases ?
Limonka
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Well, if manufacturer recommendation is to use SAE 40 viscosity class and ACEA A3 oil, the higher HTHS in this case should provide better overall engine protection and prolongs engine lifetime. Is that correct ? I am aware that not all of the manufacturers provide this data, but some of them fortunately yes.
A higher HTHS viscosity within the manufacturer's recommended viscosity grades should provide more wear protection, but such added protection may not be needed depending on the engine and driving conditions, and will come at the cost of fuel economy.