The lab Cummins uses superior equipment compared to what Blackstone has, they also use GC to test fuel in oil an not flash point, they are more knowledgeable and you also get TBN at no extra cost. I would love to see FCA state that a Cummins approved lab does not know how to properly test oil samples or are not reliable, example when I did a quick UOA I used Blackstone while waiting for more Fleetguard kit to arrive, my the dealer ignored the Blackstone report, but once I put a Fleetguard UOA in front of then they knew they no longer had any excuse to ignore what it reported about fuel in the oil... This is JMHO