We do oil samples in our fleet because we can show them to auditors. The like to see them but they don't provide much value to us as operators. Coolant samples are much more preventative but it's very hard to convince the oil is the most important fluid establishment that this is the case.
Your engine is engineered to manage water in the crankcase. For every lb of diesel burned the engine produces more than a lb of water. As long as the pickup tube isn't submerged the engine will evaporate the water out. That is why I suggested cracking the drain plug.
Your engine is engineered to manage water in the crankcase. For every lb of diesel burned the engine produces more than a lb of water. As long as the pickup tube isn't submerged the engine will evaporate the water out. That is why I suggested cracking the drain plug.