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  1. Emperors6

    A video on the chemistry of boundary lubrication

    I was browsing videos on Youtube and found this interesting gem:
  2. Emperors6

    Red Line 75W90, 3.6k mi OCI, 153k mi, Cadillac CTS-V

    Previous UOA is here. VOA is here. UOA history for this vehicle is available with this search: https://bobistheoilguy.com/forums/search/?q=CTS-V&t=post&c[child_nodes]=1&c[nodes][0]=47&c[title_only]=1&c[users]=Emperors6&o=date&g=1. Note from oil analyst: "Elevated levels of Iron and Copper. For...
  3. Emperors6

    Mobil 1 0W-40, 3k mi OCI, 153k mi, 2013 Cadillac CTS-V

    Previous UOA is here. UOA history for this vehicle is available with this search: =1&c[nodes][0]=3&c[title_only]=1&c[users]=Emperors6&o=date&g=1']https://bobistheoilguy.com/forums/s...le_only]=1&c[users]=Emperors6&o=date&g=1. Notes from slip that I sent in: " OLM was at 53%. Changed because oil...
  4. Emperors6

    Driven DI50 15W50, 118 mi OCI, 10k mi, C7 Corvette Z06

    118 miles, 2.2 engine hours since oil change. Last UOA is here. UOA history of this vehicle: https://bobistheoilguy.com/forums/search/2149941/?q=Z06&t=post&c[child_nodes]=1&c[nodes][0]=3&c[title_only]=1&c[users]=Emperors6&o=date&g=1 Notes from slip: "Took oil sample with vacuum pump through dry...
  5. Emperors6

    Red Line 75W110, 10.5k mi OCI, 150k mi, Cadillac CTS-V

    Previous UOA is here. VOA is here. UOA history for this vehicle is available with this search: https://bobistheoilguy.com/forums/search/?q=CTS-V&t=post&c[child_nodes]=1&c[nodes][0]=47&c[title_only]=1&c[users]=Emperors6&o=date&g=1. Notes from oil slip: "I stuck a "Digi-Sense Irreversible 6-Point...
  6. Emperors6

    Mobil 1 0W-40, 6k mi OCI, 150k mi, 2013 Cadillac CTS-V

    Previous UOA is here. UOA history for this vehicle is available with this search: =1&c[nodes][0]=3&c[title_only]=1&c[users]=Emperors6&o=relevance&g=1']https://bobistheoilguy.com/forums/s...le_only]=1&c[users]=Emperors6&o=relevance&g=1. Switched to a shorter OCI of 5k/6mo (approximately)...
  7. Emperors6

    Mobil 1 0W-40, 8.4k mi OCI, 144k mi, 2013 Cadillac CTS-V

    I switched away from Blackstone. Previous UOA is here. UOA history for this vehicle is available with this search: https://bobistheoilguy.com/forums/search/?q=CTS-V&t=post&c[child_nodes]=1&c[nodes][0]=3&c[title_only]=1&c[users]=Emperors6&o=relevance&g=1. Going forward going to run an OCI of...
  8. Emperors6

    Valvoline VR1 Racing Full Synthetic 20W50, 2.6k mi OCI, 10k mi, C7 Corvette Z06

    UOA through https://www.speediagnostix.com/: Notes from report: -9854 miles, 224 engine hours on engine -2646 miles (street+track), 56 engine hours (street+track) on current OCI This UOA is cumulative with the other Valvoline UOAs. -Oil sample was taken when oil + filter were changed. The oil...
  9. Emperors6

    Driven DI50 15W-50

    VOA done through https://www.speediagnostix.com/:
  10. Emperors6

    Red Line 75W110, 13k mi OCI, 139k mi, Cadillac CTS-V

    All mileage is in kilometers not miles. Notes from oil slip: "Regular summer and winter driving in northeast US and Canada." Next fill is Red Line 75W110. It looks like the UOA is getting worse for my LSD. Should I plan for it to fail soon? It has an oil cooler and pump installed but I don't...
  11. Emperors6

    Valvoline VR1 Racing Full Synthetic 20W50, 2.3k mi OCI, 9.5k mi, C7 Corvette Z06

    This is the fourth sample in the current OCI. If you take a look below and see the Valvoline UOAs they are all from the same OCI. I keep sampling after track events. Another thing to note is that I keep adding top-up oil which actually refreshes the oil's viscosity, additive package, and also...
  12. Emperors6

    Valvoline VR1 Full Syn 20W-50 and Mobil 1 15W-50

    I needed VOAs on some oils I'm comparing to see what % viscosity loss, oxidation increase I'm getting and what the initial additive package looks like. It was surprising for me to find that M1 spec says 18 for viscosity, and 20.5 for VR1. Lubrication analyst says that's normal to see different...
  13. Emperors6

    Valvoline VR1 Racing Full Synthetic 20W50, 1.3k mi OCI, 8k mi, C7 Corvette Z06

    See previous thread for background. In this one I ran Valvoline VR1 20W-50 (Full Synthetic). I took three UOAs: (1) on 7/12/22 - 100 miles of street driving after oil change, (2) on 7/29/22 - right after first track session, (3) on 8/3/22 - after the track event and about 250 street miles. The...
  14. Emperors6

    Mobil 1 15W50, 1.3k mi OCI, 7k mi, C7 Corvette Z06

    So, I had the LT4 rebuilt last year after it lost compression in one cylinder due to a bad tune from what I thought was a good shop. I spent most of last year dealing with the excessive blowby of the new engine due to the larger than normal ring gaps. So we tried different catch cans but they...
  15. Emperors6

    Mobil1 LV ATF HP Blue, 7.9k mi OCI, 34.9k mi, C7 Corvette Z06 8L90

    All mileage is in kilometers not miles. Notes from oil slip: "Did repair on tranny pan, so had to drain fluid." Previous fill was also Mobil1 LV ATF HP Blue.
  16. Emperors6

    Mobil 1 5W-30, 9.6k mi OCI, 135.3k mi, 2013 Cadillac CTS-V

    All mileage is in kilometers not miles. Notes from oil slip: "Mixed street plus highway use. No issues noted other than severe winter driving (< -4F)." This fill was 5 qts of Mobil 1 5W-30 and 1 qt of Mobil 1 15W-50. Next fill is 6 qts of Mobil 1 0W-40 FS.
  17. Emperors6

    Is Mobil 1 15W-50 5qt out of stock everywhere?

    ...especially at Walmart? Does anyone know when it'll be back in stock?
  18. Emperors6

    Red Line 75W90, 17k mi OCI, 126k mi, Cadillac CTS-V

    All mileage is in kilometers not miles. Notes from oil slip: "mostly regular driving in all seasons including harsh winter in northeast US and Canada plus more winter autocross driving events." Next fill is Red Line 75W110. Previous fill was Red Line 75W90 (same as this one).
  19. Emperors6

    Red Line D6 ATF, 46k mi OCI, 126k mi, Cadillac CTS-V

    All mileage is in kilometers not miles. Notes from oil slip: "mostly regular driving in all seasons including harsh winter in northeast US and Canada plus some winter autocross driving events." Next fill is same as this fill.
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