Technical sharing

Recognition and Treatment of Engine Oil Contaminated with Water or Fuel Engine oil contaminated with water or fuel loses its lubricating properties, causing corrosion, cylinder scoring, increased fuel consumption, and even severe engine damage. Signs of Contamination: Water contamination: oil turns milky brown, foamy, with musty odor; viscosity decreases, TAN increases; engine hard to start, emits white-blue smoke. Fuel contamination: oil becomes thinner, strong smell of raw fuel; viscosity and flash point drop significantly; engine consumes more fuel, emits black smoke, spark plugs fouled with carbon. Causes: radiator leakage, damaged gasket, condensation, faulty fuel injection system, or improper operation. Flooding case: water enters through air intake, PCV, or gaskets, causing oil emulsification, sludge formation, and high risk of hydrolock. Remedies: do not start engine after flooding; drain oil and replace filter; flush multiple times; replace air filter, spark plugs, injectors if needed; inspect radiator, injectors, bearings; overhaul if severe. Recommendations: regularly analyze oil (ASTM D6304, D445, D5185, D92); shorten oil change intervals in flood-prone areas; use oils with anti-rust and water-separating additives.

Denis Oil Autox & Ultra is a premium semi-synthetic engine oil formulated with Densyntech technology and U.S. additive packages. It offers excellent thermal stability, oxidation resistance, superior cleaning, anti-wear protection, and fuel efficiency. Suitable for Japanese, Korean, and European vehicles, Denis Oil is a reliable choice for driving conditions in Vietnam.

Choosing the right engine oil helps cars, trucks, and ships run smoothly, last longer, and save fuel. DENIS OIL – High-quality lubricant solutions for all conditions.

Heat Transfer Oil is an industrial oil used in heating systems, drying processes, and reactors, with advantages of fast heat transfer, high thermal stability, and safety.

Hydraulic oil, commonly referred to by technicians as "Nhớt 10", is a fluid used to transmit pressure and motion within a hydraulic system.

Engine overheating occurs when the amount of heat generated exceeds the cooling capacity of the entire cooling system. There are many causes of engine overheating during operation, and if left unresolved for a long time, it can cause serious damage. Below are the possible causes that can make your vehicle overheat.