According to OPs signature he has multiple vehicles on WVO.

All of them are IDI OM61x and OM60x engines.

VWVO + CDI = certain death.

I found the MB spec info on fuels, it was on startekinfo
Document "S-0473-08B Factory Approved Service Products"

Service Products
Diesel Engines
Diesel Engines as of model year 2007
All diesel engines require S15 Ultra Low Sulfur Diesel (ULSD) fuel (15 ppm Sulfur maximum). Failure to use ULSD fuel can severely damage the vehicle’s exhaust after-treatment device. Refer to Product Information (page 14) for a sample of diesel fuel pump labeling.

Diesel Engines -
Model year 2006 and prior
Use only commercially available vehicular diesel fuel number 2 or number 1 (ASTM D975 Number 2-D or Number 1-D).

As of model year 2005
For information on cold weather operation, refer to the vehicle Operator’s Manual.

Pre-model year 1999
For information on cold weather operation, refer to the vehicle Operator’s Manual or Service Information MBNA 00/7(11-82).

B5 Biodiesel
Mercedes-Benz approves the use of B5 biodiesel (standard diesel with a maximum of up to 5% biodiesel content) in all Common Rail Injection Diesel “CDI-engines.” Diesel fuels containing a higher percentage of biodiesel content will cause damage to your engine and are not approved. As biodiesel can be refined from a variety of raw materials resulting in widely varying properties, the only approved biodiesel content is one that meets ASTM D6751 specification. It must also have the necessary oxidation stability (min. 6h, proved with EN14112 method) to prevent damages to the system from deposits and/or corrosion. Please ask your service station for further information. If the B5 biodiesel blend is not sufficiently labeled to clearly indicate that it meets the above standards, please do not use it. The Mercedes-Benz limited warranty does not cover damage caused by the use of fuels not meeting Mercedes-Benz approved fuel standards.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech