- Do you have later samples for yours? I have what looks to be the 2nd change @ 21K or so. Was wondering if you continued with the EFM, and if you had further samples you could share with me.
I did a sheet showing correction:
I'd like to see further samples to see what the trends look like!
For example: Potassium is supposedly from a lifter bore coating, or similar - yet, the rate is relatively steady to 20K - I want to see if this starts trending down.
Iron is 4ppm/1K, Aluminum is 2ppm/1K, and Copper is 1ppm/1K - I expect copper to stop leaching shortly thereafter, and we hope to see Aluminum and Iron fall a little more - then remain relatively steady.
You have 60.9% of Reference TBN @ 8577 miles. Starting point was 95.7% - so this oil will run a LONG, LONG interval if you choose to do so! (I generally recommend disposal at 30%). It's important to note that TBN is not linear - so I can't say it'll last 17K or something...It may go significantly longer - or it may not, but there's ZERO concerns at the 8577 on this sample, and given the amount of reserve, 10K definitely wouldn't be an issue.
The oil lost 8.51% of the reference viscosity with 0.3% dilution - Start Point was slightly thinner than reference due to prior sample - about 1.4% - so it thinned ~7.4% over the interval. Your residual (if you indeed used 9 quarts) is 10.5%. This is the 2nd sample after the factory oil was removed - so you have about 5.25% factory oil remaining in this sample. This may actually be affecting TBN loss and Viscosity loss still at this phase - and I wanted to see further samples if possible to see if this is improving with higher and higher percentages of EFM, or if it's indeed characteristic of the oil! If you are actually using 8.5, please let me know - and I'll adjust the sheet, as that will bring down your corrected numbers slightly.
If you have more recent samples, please post them, or send them to me via Facebook (I'm pretty easy to find), so I can plug in the data and see what the trends look like with this oil.
For anyone else with extensive ISO certified lab samples of their oil on this platform, using the same oil for several intervals in succession - please drop me your reports - here, message, Facebook, however you like! VOA's for the oil (like @mat_haas
provided for EFM) are useful, in that without that, we don't know what's coming from the additive packages/base oil, versus what is wear metal!