Rotella T6 in 2015 q7 TDI

oilhammer said:

Exactly, so it'll take ~$100 (at least) of your money to provide any trend one way or the other. All you have provided is anecdote.
You'd need to have a UOA done over a time period of several service intervals of various oil types in several identical CBEA engines driven in similar fashion.
Actually, it will likely cost a couple hundred to do that.
If you'd like to pay for it, send me several sample kits and I will provide the oil, although it may be some time as many of the 2009s are gone which will only leave the Audi A3s through 2014 as they still used the CBEA. Although I'd think a CJAA after 100k miles should be broken in enough to negate the mechanical differences, but maybe not.
You have my word I will be absolutely fair and honest and thorough in sample gathering. As I stated, I have a couple with over 300k miles I can sample from.

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tikal said:

From my experience, oil analysis with TBN values are averaging at least $25 to $35, so I think the total cost to show statistically that VW spec 507 oils in CBEA engines are inadequate in 10K mile OCI might be a little bit even more expensive than that :-(
Another option, more practical in my view, is to consult/ask oil analysis labs such as Blackstone Labs, Oil Analyzers, and TDI independent trusted mechanics
Also in Europe VW 507 oils have been used successfully in a longer period of time/Kms and with many more types of TDI vehicles

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CleverUserName said:

My mechanic was skeptical of 507 and recommended a 6-7k oil change interval. I did 10k once just as an experiment, which are the results you see. He was correct.
There are poor reports like mine posted on other forums. It’s not an anomaly.
I’d trust the report much more than anyone else’s opinion. On forums or anywhere else. The numbers tell the tale...
Wix 24077 oil analysis kits are $9.49 at Rockauto and includes TBN. Buy 5 for combined shipping for $2.99 and include the 5% off coupon and they are $9.62 each delivered to your door.
https://www.rockauto.com/en/parts/wix,24077,filter,8600
Add USPS shipping of ~ $4 to the closest ALS tribology lab and your $13.62 for a comprehensive UOA including TBN.

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