http://www.blackstone-labs.com

I was wondering if anybody here has used this?

I was thinking of sending a sample from my 260E to see what they say out of curiosity?

I have been using Mobil1 Delvac 15-40 diesel oil in my M103...Would they think that is odd or would they know this is a recommended oil to use?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k