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TomNJ

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  1. TomNJ
    Well that picture was taken some 16 years ago so my hair is a little more gray. I use a PC and so far Google / Chrome has done a pretty good job of translating, at least enough for me to generally understand, but misunderstandings are certainly possible. Please do not take offense if the translation misses the mark. Also please understand that I am not a mechanical engineer. It has been many years since I worked on car engines and am not up to date on that technology. Most of my experience is with synthetic lubricants, especially esters.
  2. TomNJ
    The challenge for jet engine oils is primarily temperature, not load. The oil lubricates a turboshaft spinning at very high speed through concentric bearings and it is entirely hydrodynamic lubrication, not boundary. That is why the oils can be so thin. The temperatures, however, are extreme - both hot and cold. Sump temperatures can be over 200 ° C and spot temperatures can be 300-400 ° C. Outside the engine, air temperatures can be -50 to -60 ° C. Only POEs can handle these temperature extremes, which is why virtually every jet engine in the world operates exclusively on POE based oils, and
  3. TomNJ
    If the phosphorus result is correct, this equates to 2.8% TCP in the virgin oil. The loss may be due to evaporation (the molecular weight of TCP is only 368) and / or dilution with residual oil. Note that the viscosity was also reduced so there must be some dilution or contamination.
  4. TomNJ
    Like with engine oils, no scientific tests or published papers. The jet oil will dilute the extreme pressure additives and possible soften seals. Probably no harm at low doses, but little gain as well. I have formulated synthetic jet and industrial oils for many years and the process often gives surprises with unexpected results. Ingredients have to be selected and balanced to work with each other, which can be a long and expensive process. Once a formulation has been completed, balanced, tested and approved, I do not change it. Of course this is a oil forum and peo
  5. TomNJ
    I meant to post the above in the other thread titled "Mobil Jet Oil 2 fresher (for aircraft turbines)" I must have followed a link and wound up in this thread. Sorry.
  6. TomNJ
    Thank you all for your kind welcomes. If it ever appears that something I say is offensive, it must be the translation software as I would not do so. I am not aware of any scientifically conducted studies or published papers regarding adding jet engine oil to PCMO, transmissions, or gear boxes, and I am not convinced by uncontrolled testimonial claims. Jet engine oils are very thin, less than 0W-8, and have no ZDDP or other extreme pressure additives. Esters provide some improved lubricity due to metal attraction, but they are not nearly as strong as extreme pressure additives
  7. TomNJ
    Thank you all for your kind welcomes. If it ever appears that something I say is offensive, it must be the translation software as I would not do so. I am not aware of any scientifically conducted engine studies or published papers concerning adding jet engine oil to PCMO, and I am not convinced by uncontrolled testimonial claims. Jet engine oils are very thin, less than 0W-8, and have no ZDDP or other extreme pressure additives. Esters provide some improved lubricity due to metal attraction, but they are not nearly as strong as extreme pressure additives. Also the e
  8. TomNJ
    Here is a cut & paste from my LinkedIn profile: Retired after 38 years at Hatco Corporation, a manufacturer and global leader in synthetic esters and synthetic lubricants (now a division of Chemtura/Lanxess). Managed in a broad range of disciplines, including Quality Control, Research & Development, Process Improvement, and Sales & Marketing. During the long career was actively involved in laboratory testing, lubricant formulation, laboratory management, ester molecular design, process improvement, raw material procurement, international sales, and sales management. For
  9. TomNJ
    I worked for 38 years for Hatco Corporation, a major manufacturer of synthetic esters for lubricants. Here is my LinkedIn profile: https://www.linkedin.com/in/thomas-schaefer-8523732/
  10. TomNJ
    Yes I do not recommend adding either POE jet engine oil and/or POE refrigeration oil to PCMO. Small amounts probably will do no harm but these products were designed for special applications, not car engines.
  11. TomNJ
    Alkylated amines are most useful in high temperature applications because the alkylation keeps the break-down products in solution, making less deposits, and also due to their lower volatility. POE based jet engine oils are designed specifically for jet turbine engines and APUs. They are based on highly polar, low viscosity POEs which can swell and soften many seals. The seals used in jet engines are designed to be compatible with the POE, not the other way around. Also they contain no detergents, dispersants, or extreme pressure additives, and most have no anti-rust additives,
  12. TomNJ
    MJO 254 is a 3rd generation turbine oil that provides cleaner operation (less deposits) at high temperatures due to an advanced anti-oxidant. It was approved under the MIL-PRF-23699 specification in 1979 and underwent commercial approvals during the 1980s. Their latest product is MJO 387, a 4th generation oil that further improves high temperature cleanliness and is in the process of completing commercial approvals, a process that takes many years.
  13. TomNJ
    POE based jet engine oils, which is pretty much all of them, contain 2-3% total anti-oxidants. They usually have two anti-oxidants in order to exploit synergies. The ratio of the anti-oxidants and the exact chemistries vary with each product. The better products contain alkylated amines which leave less deposits at high temperatures.
  14. TomNJ
    Sorry for using English but I don't speak Russian. If you speak three languages, you are trilingual; if you speak two languages, you are bilingual; if you speak one language, you are American! And so I am. Mobil Jet Oil II is based on a pentaerythritol type polyol ester using fatty acids from C5 to C10, both linear and branched. It contains two amine type antioxidants, specifically phenyl-a-naphylamine and dioctyl diphenylamine. It also has Tricresyl Phosphate for anti-wear and a triazole type yellow metal inhibitor, and a silicone type anti-foam. The polyol ester base oil is

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