First UOA on the Mazda. I don't know if I should be worried about this copper, or just keep an eye out as Blackstone recommends. Everything else looks ok though.
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Originally Posted by JustN89
There's nothing to see here, imo. 3 ppm above "average" is next to nothing. The viscosity did shear down a bit, but at this point I don't see any reason indicating that you have to make changes. I do agree that you have some fuel dilution happening. If it were my car in that climate and I were outside of warranty, I'd pick a good 0W-30 and go with that. However, I don't think you need to do anything different here. I'd run another 5k-ish mile OCI and resample if you want verification that the copper truly was nothing or confirmation that your engine is continuing to dilute the oil.
I might try that next. I will resample this too to see if the copper is just an anomaly, because everything else looks pretty good.
The fuel is there, but keep in mind too that this is a VERY thin oil. Virgin KV @100 is only 7.9. So the fact that it didn't shear out of the acceptable range for a 0w20 is actually pretty remarkable.
Alright I'm confused. I thought 7.9 cSt would make it a 0W-16 and 6.1 cSt was minimum for 16 Grade.
SAE Viscosity Chart (High Temp) | ||
100° C (210° F) | ||
SAE Viscosity | Kinematic (cSt) | Kinematic (cSt) |
100° C Min | 100° C Max | |
8 | 4.0 | TD] |
12 | 5.0 | TD] |
16 | 6.1 | TD] |
20 | 6.9 | TD] |
30 | 9.3 | TD] |
40 | 12.5 | TD] |
50 | 16.3 | TD] |
60 | 21.9 | TD] |
Source: Engine Oil Viscosity Classification, J300 Jan2015, SAE. The full publication is available from SAE at www.sae.org. |