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  1. Gokhan

    Nissan introduces engine with 50% thermal efficiency

    This is great! I need to watch the whole YouTube video when I get a chance. I love the way the Japanese nod when they are introduced. It's funny though they are dubbed with female voiceovers. 50% thermal efficiency is great, and they have certainly put a lot of effort into this, and it is...
  2. Gokhan

    Toyota Japan MSDS website

    Here are the MSDSs provided by Toyota Japan, including those for TGMO by ExxonMobil and Idemitsu. You will probably need Google Translate. Enjoy! TGMO 0W-16 SN was GTL, but TGMO 0W-16 SP has been downgraded to petroleum-based Group III...
  3. Gokhan

    Wax ratings on Dmitry's Garage

    Dmitry's Garage has a very nice rating of car waxes. Adam’s Polishes Graphene Ceramic Spray Coating is very impressive.
  4. Gokhan

    Toyota 90915-YZZF2 oil filter superseded by 90915-YZZN1

    Toyota 90915-YZZF2 oil filter made in Thailand had been there for about a couple of decades since it superseded 90915-YZZA2. It has just been superseded by 90915-YZZN1. I wonder what is different with 90915-YZZN1. Someone will have to buy one and cut it open...
  5. Gokhan

    Toyota dealers now offering both the TGMO and Mobil 1

    It's nice to see the Toyota dealers now offering both the TGMO and flagship Mobil 1. Both products are made and distributed by ExxonMobil.
  6. Gokhan

    Toyota dealer uncertainty in the oil viscosity used

    So, it's been one year since my car was manufactured in August 2019, and I took it to a local Toyota dealer today for the yearly oil change with the odometer at 5,851 miles, wearing my mask of course. This would be the first oil change since the factory fill, and it's a courtesy maintenance...
  7. Gokhan

    Chevron Phillips Synfluid® PAO FAQ

    Chevron Phillips explains the superiority of PAO in oxidation tests among its other desired properties in this FAQ. <span style="font-weight: bold"><a href=""...
  8. Gokhan

    Synthetic lubricant base-stock processes and products

    A very nice article on synthetic base stocks. <span style="font-weight: bold"><a href="" target="_blank">Synthetic lubricant base-stock processes and products</a></span> <span...
  9. Gokhan

    0W-8 is here: JASO GLV-1

    They bench-tested the oils in a Toyota Prius/Prius Prime 2ZR-FXE engine (firing engine) to measure the fuel-economy improvement. They also dyno-tested the oils in a Nissan Rogue Sport MR20DD engine (motoring engine) running in a real vehicle. "SAE 0W-8 high-moly oil demonstrated 0.5% fuel...
  10. Gokhan

    GM dexos1â„¢ Gen 3 delayed for at least three months due to COVID-19

    <span style="font-style: italic"><span style="font-weight: bold">dexos1â„¢ Gen 3 progress</span> In other specification news, General Motors' (GM) dexos1â„¢ Gen 3 has been delayed for at least three months due to COVID-19. GM is planning to revisit the timing in July of this year. dexos1â„¢ Gen...
  11. Gokhan

    Infineum article and resource repository

    There are currently 178 articles and 68 resources in the Infineum article and resource repository. Enjoy! <ul style="list-style-type:disc;"><li><span style="font-weight: bold"><a href="" target="_blank">Infineum...
  12. Gokhan

    Infineum trends: Passenger vehicles (2019)

    Excerpts: <span style="font-style: italic">GM dexos1 Gen 3, the JASO ultra-light viscosity GLV spec, and, yes, ILSAC GF-7 will follow. Nathan Siebert and Josh Frederick share some insights on the next generation of specs. Nathan Siebert: "To continue our great history of innovation, we will...
  13. Gokhan

    Encyclopedia of Lubricants and Lubrication

    This is the must-have and must-read encyclopedia on BITOG. <span style="font-weight: bold"><a href="" target="_blank">Encyclopedia of Lubricants and Lubrication—2014 Edition—Editor: Theo Mang—Springer Reference</a></span>
  14. Gokhan

    Hydroprocessing explained

    These are some great articles on how Group II, Group II+, Group III, Group III+, and GTL base oils are made through hydroprocessing, as well as how Group I base oils are made through refining. <ul style="list-style-type:disc;"><li><span style="font-weight: bold"><a...
  15. Gokhan

    Automated calculator for the A_Harman index, VII content, and base-oil viscosity

    I have now <span style="font-style: italic"><span style="font-weight: bold">fully automated</span></span> my A_Harman index, effective VII content, and base-oil viscosity calculator by building in the ASTM D341 viscosity - temperature relation (Walther formula) into the spreadsheet. <span...
  16. Gokhan

    Does the sulfated ash (SA) level really matter for intake-valve deposits (IVD)?

    I will argue that the sulfated ash (SA) level -- that is the metal content of an oil -- does not matter for intake valve deposits (IVD) in gasoline direct-injection engines. The IVD is mostly composed of coked base oil with ash (metal) additives that doesn't evaporate. It also contains some...
  17. Gokhan

    Updated VII content and base-oil-and-DI viscosity at 150 °C estimate spreadsheet

    Boxnuts and I were discussing the density correction factor in my spreadsheet for the VII content, which is effectively equivalent to the A_Harman index, and base-oil viscosity at 150 °C (BO DV150 = HTFS), which is the full-shear viscosity of an oil at 150 °C (as opposed to the high-shear...
  18. Gokhan

    The synthetics are coming: Base-oil quality index (BOQI) revisited

    I just saw this very nice article on base-oil demands by API SP/ILSAC GF-6 and GM dexos1 Gen 3. It is an interesting read indeed. <span style="font-weight: bold"><a href=""...
  19. Gokhan

    German Castrol is back! (But you can't get it)

    I've just found out that Castrol is still making a fully PAO-based Castrol Edge 0W-40 A3/B4, like the original fully PAO-based 0W-30 A3/B4. Other Castrol 0W-40 A3/B4 oils are not fully PAO-based anymore; therefore, they cannot be legally sold as full synthetic in Germany. This one can be. It is...