Technical sharing

Discover the vital role of engine oil in protecting, lubricating, cleaning, cooling, and enhancing the performance of your engine. Learn the technical guidelines for choosing the right oil for both gasoline and diesel engines. Brought to you by the experts at DENIS OIL.

Engine oil turning black is a normal process caused by heat, soot, and cleaning action. Dark oil isn’t always a sign it needs to be changed. Learn the real reasons and how to know the right time to replace your oil for better engine protection.

Dù có thi đạt điểm tối đa, hay lái xe đã ít lâu nhưng chưa hẳn đã rõ các lưu ý dưới đây giúp cho bạn lái xe thoải mái, an toàn hơn.

Common Issues & Engine Seizure Causes – Kia Carnival After long-term use, Kia Carnival often faces: oil leaks, transmission shudder, ABS sensor failures, sliding door malfunctions, radiator leaks, weak shock absorbers, and high fuel consumption. Engine seizure causes: low oil, wrong oil filter installation, poor-quality oil, overheating (radiator/fan failure), hydro-lock, ignoring warning lights. Oil recommendation: • Petrol: SAE 5W-30, API SN/SP • Diesel: SAE 5W-30 or 10W-40, API CI-4/CJ-4/CK-4

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.