the problem mentioned above is called "black sludge",it is often appeared in the stop&go engine after PCV(Positive Crankcase Ventilation)employed in the engine design to reduce the hydrocarbon emmision. the evaporated fuel came from the blowing-by reacted with water and NOx generated...
Be careful to add any defoamant to your system,Most of the foaming problems is relative to the operation mistake, usually the lubricant is carefully balanced with varitey of additives including defoaming additive,I suggest you to do the follows:
1. Check the oil level ,if it is too high or too...
