This car is indeed a 2005 VW Passat PD TDI, that specs the VW 505.01 oils.
I'll have another sample coming in within the next few weeks, so it'll be interesting to see how it turns out.
The lab used was Wix Filters, which contracts out to Stanley Services.
I noticed in both analysis reports that the Aluminum level is quite high and is significantly more than the 0.5-0.8ppm/1000 miles that the TDIs normally produce, at least from the analysis results that I’ve seen posted here on BITOG. The Al continues to drop, but not by much. In addition, in the 2nd sample, the soot is more than 10x the amount that it was in the first sample, which is the only reason that I can come up with at this point which may have prevented the Al level from dropping further. The sudden and significant increase in soot may have also caused the rise in viscosity. Nor do I see any sign of dirt ingestion, as the Si level is quite reasonable and there is no Ni present. Lastly, I’m happy to note that the Fe level is much lower in this report compared to the same engine running a 505.01 oil, which I mainly believe is due to the Amsoil staying in grade and protecting better against valvetrain wear.
I think this report is a good candidate for Terry's services in an attempt to find the cause of the high Al level.
Thoughts?
Thanks,
Michael