Join Date: Feb 2007
Location: Southern California
First time for "USED" oil "Wear Test" data
This is the first time I've "Wear Tested" used oil, to see how it performs compared to the new oil I've always tested up to now.
“NEW”5W20 Castrol Edge with Titanium, API SN = 99,983 psi “load carrying capacity/film strength”
zinc = 1042 ppm
phos = 857 ppm
moly = 100 ppm
titanium = 49 ppm
Total anti-wear = 2048 ppm
“USED”5W20 Castrol Edge with Titanium, API SNwith 5,000 miles on it = 107,391 psi “load carrying capacity/film strength”
Used oil lab test quantities:
zinc = 791 ppm (down 251 ppm or down 24%)
phos =643 ppm (down 214 ppm or down 25%)
moly = 67 ppm (down 33 ppm or down 33%)
titanium = 36 ppm (down 13 ppm or down 27%)
Total anti-wear = 1537 ppm (down 511 ppm or down 25%)
The 107,391 psi wear protection capability of the used oil above, is a 7% “higher” wear protection capability with this batch of “used” oil, compared to the original “new” test oil batch. Repeat testing of both the used batch of oil and the original new batch of oil, resulted in consistent and repeatable results for each batch. So, all the wear protection capability numbers shown above are absolutely correct, and simply are what they are.
This is of course only a single used oil data point. So, it is too early to know for sure if this particular used oil showed a little higher level of wear protection, compared to new oil, because of differences in separate batches of oil produced at different times, or if used oil might tend to show somewhat improved values. More upcoming used oil testing will shed more light on that. But, either way, it is comforting to see that as oil goes at least 5,000 miles, it does NOT lose its wear protection capability, even though the zinc and the other anti-wear component levels have dropped significantly.
And as you can clearly see in particular, the 24% zinc depletion noted above, did NOT result in any loss of wear protection at all. Previous testing of new oils with various levels of zinc, have shown the same exact results time and time again, where zinc levels alone had no affect at all on the wear protection capability of any motor oil. Higher zinc levels DO NOT and CANNOT provide more wear protection. Higher levels of zinc can only provide LONGER wear protection, because extra zinc will simply take longer to become depleted. The base oil and its additive package “as a whole”, are what determine an oil’s wear protection capability, NOT how much zinc is present.
The next “used oil” to be tested, will be the number 1 ranked 5W30 Pennzoil Ultra, API SM. I’m running that oil in a 435 HP LS2 engine right now, and should have some data on how it performs after 5,000 miles, in a couple of months.
Member SAE (Society of Automotive Engineers)