Valvoline Restore and Protect

From my data, it suggests that a 10k HPL oil interval even with a 5k oil filter change, the iron wear rate was double that of Valvoline Restore and Protect. A 10k oil interval contains higher accumulative levels of Fe that cannot be removed by a new filter but only by a full oil change.
But your first run of HPL was 1.25ppm/1000 miles. You have a single run of Valvoline Restore and Protect at 0.94ppm/1000 miles, which was effectively identical to your Valvoline Extended Protection run, which was also an API additive package lube. These are all insignificant; these are all extremely low uptake rates if you look at some of the others in my post. Look at the swings in #2 for example.

And yes, the range of particles able to be seen by spectrography is below the filtration range captured by typical oil filters, so a filter change, aside from some dilution from make-up oil, where applicable, won't have an appreciable effect on concentration visible to a used oil analysis. Iron tends to track with mileage and we often see declining iron uptake rates on longer OCI's due to established chemistry. Often, but not always. The list of used oil analysis in #2 (the FJ Cruiser) had a considerable number of long intervals.
 
But your first run of HPL was 1.25ppm/1000 miles. You have a single run of Valvoline Restore and Protect at 0.94ppm/1000 miles, which was effectively identical to your Valvoline Extended Protection run, which was also an API additive package lube. These are all insignificant; these are all extremely low uptake rates if you look at some of the others in my post. Look at the swings in #2 for example.

And yes, the range of particles able to be seen by spectrography is below the filtration range captured by typical oil filters, so a filter change, aside from some dilution from make-up oil, where applicable, won't have an appreciable effect on concentration visible to a used oil analysis. Iron tends to track with mileage and we often see declining iron uptake rates on longer OCI's due to established chemistry. Often, but not always. The list of used oil analysis in #2 (the FJ Cruiser) had a considerable number of long intervals.
There was no oil added except in the 10k OCI. 16oz added to pre-fill the oil filter housing in a 6 qt crankcase capacity.
 
Is this a controlled test where everything is the same run to run? No. It's on the road with every trip being different, the trips even if daily commute are different, in different weather, etc etc. Too many variables to differentiate such small differences. Reminds me of two women in my office who were debating whether a Mercedes or Volvo was safer based on crash test scores within .1 of each other. Honey, when a semi hits you you're going to die in either one.
 
Why do Euro oils show a little higher iron than others?

Thanks for making that compilation of used oil analysis. It's nice having them in one place. 🫡
More detergents I suspect is the primary reason, but they also have more ZDDP.

I shared some info about this in a previous thread about ZDDP (and how we don't entirely understand the intricacies of its surface interactions) but say a full-SAPS Euro oil with a high starting TBN and a lot of detergent chemistry as well as considerably more ZDDP, when it is freshly introduced to an engine, there's a period where that chemistry disrupts the existing tribofilms while new ones are trying to establish. As the oil ages and the strength of that chemistry fades, things settle down (as @ZeeOSix mentioned) and the uptake rate drops. This is the "sweet spot" for OCI duration, as the detergent/dispersant chemistry is still fully function, but muted, and the AW and FM chemistry has established itself. This is where wear is the lowest and also where chemical interactions with surfaces have settled.

That said, ZDDP is an ester and interacts with surfaces itself, so fresh ZDDP chemistry, when introduced, will also displace existing ZDDP tribofilms, and this interaction can chemically remove atoms from the surface as it works to adhere to it and these are visible to the spectrograph, so you can "see" this iron for example, in a used oil analysis, even though it's not actually wear.


Esters can of course chemically chelate elements that then end up being visible in a used oil analysis as well, probably the best example I can think of to illustrate that last point is the copper we see in HEMI used oil analysis, which has no mechanical origin. It predominantly shows up when oils with esters are used, as they are polar, and their attempt to adhere to whatever surface it is in the HEMI that has copper as part of it, displaces copper atoms that are picked up in the oil analysis.
 
Shortage of Valvoline Restore and Protect 5W-30 at a local Walmart.
First I thought that 5W-30 is already Dexos1 Gen3, but then I noticed that was Extended Protection.

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