04 VW TDI - Motul 506.01 0w-30 - 13k on car, 5k on oil

[ruking77]

What in your estimation is the reason why one is "fuel diluted" (0w30 actual) vs "normal" when marked as 5w40.??

 

[SUNRG]

quote:

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Originally posted by ruking77:
What in your estimation is the reason why one is "fuel diluted" (0w30 actual) vs "normal" when marked as 5w40.??

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i don't know. i've asked them and i'm awaiting a reply. my guess is that maybe when they enter 5w-40, if the sample comes up out of grade it tries to determine a cause. fuel dilution does decrease viscosity and could put an oil out of grade, but 10.28 is perfect for an 0w-30 oil. in fact, the viscosity increased slightly from the VOA (9.36) to the UOA (10.28), which contradicts the fuel dilution flag.

 

[SUNRG]

the first image below is of two UOAs, a 5k OCI using Castrol 505.01, then a UOA from sample of the Motul 506.01 after 5k of use. i decided to pull the 506.01 and now have ELF 505.01 in the car. they thought the oil was fuel diluted 5w-40 instead of 0w-30. i wrote 0w-30 on the form but i guess they missed it.

the second image is the Motul 506.01 VOA.

here's a link to a speadsheet of all PD UOAs we've collected over at TDIclub:
http://sustainablepower.net/TDI/OA/PD_Oil_Analysis_Spreadsheet.htm

 

[oilyriser]

Where did the molybdenum and chromium come from?

 

[SUNRG]

quote:

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Originally posted by oilyriser:
Where did the molybdenum and chromium come from?

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I don't know about the Mo, but they re-ran the sample and the Cr majically disappeared...