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  1. J

    Impact of Lubricants on Engine Friction and Durability

    Here's a nice set of slides by Ian Taylor. I think the most interesting ones are about the impact of Lubricants on Oil Film Thickness. Note the film thickness being a function of the square root of the oil viscosity. Doubling film thickness requires quadrupling the viscosity in such cases. <a...
  2. J

    Formulations to Enhance Engine Efficiency

    Lubricant Formulations to Enhance Engine Efficiency in Modern Internal Combustion Engines <a href="https://www.osti.gov/servlets/purl/1351980" target="_blank">https://www.osti.gov/servlets/purl/1351980</a> This was a three year long effort and they did some great work. Some things I thought...
  3. J

    Engine friction reduction trends

    The main points should be familiar to those of us who read oil papers, but I’m posting it because it’s a good paper. It’s from 2016. The statements below are not all in the paper. Some come from other sources. Thinner oils push the lubricant regimes to the left on the Stribeck curve. Yep...
  4. J

    Testing BG EPR and Amsoil Engine Flush

    I tested the ability of these two engine flushes to dissolve very baked on motor oil varnish. The BG EPR was purchased this month and the Amsoil Engine Flush is around 10 years old. First, I needed two blobs of varnish so I created them. I put two drops of same size made of Mobil 1 20W-50...
  5. J

    Why Some PCMOs Are No Longer Suitable Fore Motorcycles

    “WHY SOME PASSENGER CAR MOTOR OILS ARE NO LONGER SUITABLE FOR MOTORCYCLES: GEAR PITTING ISSUES” Starts on page 12. <a href="https://hrcak.srce.hr/file/9883" target="_blank">https://hrcak.srce.hr/file/9883</a> “SUMMARY While there is a constant push to develop more fuel efficient oils for...
  6. J

    Engine Oil Formulations for Improved Deposit Control

    <a href="http://oil-additives.evonik.com/sites/lists/RE/DocumentsOA/stle-2016-deposits.pdf" target="_blank">http://oil-additives.evonik.com/sites/lists/RE/DocumentsOA/stle-2016-deposits.pdf</a> They showed interesting results. I wish the slides had more and better text. I’ll will do my best...
  7. J

    GDI Engine Wear Test Development

    <a href="https://crcao.org/reports/recentstudies2018/AVFL-28/CRC%20AVFL-28_Final%20Report_JAN2018.pdf" target="_blank">https://crcao.org/reports/recentstudies2018/AVFL-28/CRC%20AVFL-28_Final%20Report_JAN2018.pdf</a> The trends in the wear rates sure are complicated and don’t follow simple...
  8. J

    Carbon-cleaning Valvoline Premium Restore

    I stumbled on the patent for it, which is very interesting and informative. Esters are what performs the cleaning, and in some example formulations, alkylated naphthalene was also added. Alkylated naphthalene is between typical esters and Groups II-IV in terms of polarity. They aimed for an...
  9. J

    Amsoil Signature Series dark after only 2 weeks

    Two weeks ago, I put in a 50/50 mix of Amsoil Signature Series 10W-30 & 5W-20. I also added 0.36 qt Hy-per Lube Zinc Replacement (polymer ester). Engine is the 2.3L Ford Ranger with 92k miles. Bought it used with 72k miles and it had two oil changes of Mobil 1 0W-20 EP prior to the use of...
  10. J

    LSPI frequency and TEOST-33

    Low speed pre-ignition (LSPI) frequency and whether the oil can pass the TEOST-33 test are affected by whether the detergents used contain calcium or magnesium. Sodium was also tested. That is not new information to many of us. What I found interesting is that it also matters whether the...
  11. J

    Amsoil Briggs & Stratton Synthetic 4T Racing Oil

    Have any of you used this oil? I think it has a hefty dose of ester, given its specific gravity of 0.906. That value is in the SDS. Its volatility is not as low as I would expect, at 9.7%, but it’s low enough. I’m curious how much ZDDP, MoDTC, and detergent it has. <a...
  12. J

    Does motor oil and DOT 3 brake fluid mix?

    Why would I ask such a thing? Science, only. No practical reason. I have the answer and want to see what your guesses are and why you think your answer is correct.
  13. J

    Amsoil Manual Synchromesh Transmission oil

    2011 Ford Ranger with manual transmission with 91k miles. I just did a fluid change from M1 ATF to Amsoil Manual Synchromesh Transmission Fluid 5W-30. ATF is what is recommended. With only 12.5k miles on the ATF, shifting was notchy from day 1. It would resist going into gear and then...
  14. J

    Redline base oils

    The MSDS, dated from 2017, indicates a large percentage of two types of PAO. Esters are not listed but usually are not in MSDS sheets. Redline oils are famous for containing a lot of esters, so have they significantly changed the base oils toward less esters and more PAO? One approximate...
  15. J

    Online stores with OEM Dodge Parts

    I have not been able to find online stores for things like OEM oil and air filters. I'm trying to avoid going to the stealership parts department. I found a Mopar Parts site that appeared to be official but it is a mess and I couldn't find what I want. Thanks for any help!
  16. J

    Chevron Delo 5W-40 at Walmart

    Saw it for first time there and bought a gallon for $20. Score! Bought 2 gallons, actually. I'm going to use it in my VW 1.8T engine. Have any of you used this oil?
  17. J

    Sequence IIIG - John Deere Plus II vs Delvac 1 ESP

    Viscosity increase %: Delvac 1 ESP 5W-40: 45 John Deere Plus-50 II: 139 Sources: <a href="https://jdparts.deere.com/partsmkt/document/english/featbene/Plus50IIProductSpecificationSheet.pdf"...
  18. J

    Chemistry of dissolving varnish

    I posted this mostly for you guys in this forum but put it in the Articles forum so it doesnt quickly get buried and lost in this forum. <a href="http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2578619&#Post2578619"...
  19. J

    A review of polymer dissolution

    I'm posting this because it applies to how cleaners in motor oil may clean varnish and other hard deposits. Varnish consists of polymerized material. One thing it answers that I suspected is that solvent molecule size affects the ability to dissolve a polymer. That is why a very low viscosity...
  20. J

    Low engine friction technology paper

    It's about natural gas engines but still worth reading. <a href="http://www.osti.gov/bridge/servlets/purl/907969-qsAj4p/907969.pdf" target="_blank">http://www.osti.gov/bridge/servlets/purl/907969-qsAj4p/907969.pdf</a>
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