What type of engine oil is suitable for Yuchai National III engines?
2 Answers
The dedicated engine oil model for Yuchai National III engines is 20W-50 15W/40 CH-4 16L 15/40. Introduction to engine oil: Engine oil is a substance enhanced with additives in base oil, primarily containing anti-wear additives, detergents, dispersants, and multi-grade viscosity index improvers. Engine oil is used for lubricating internal combustion engines. It is formulated from base oils composed of petroleum-based hydrocarbons (organic compounds consisting of carbon and hydrogen) or polyalphaolefins (PAO) or their mixtures in varying proportions. Sometimes, it may contain up to 20% by weight of esters to better dissolve the additives. Functions of engine oil: The main functions of engine oil are to reduce friction and wear on moving parts, remove sludge (one of the functions of dispersants) and varnish (detergents) from the engine. It also neutralizes acids produced from fuel and lubricant oxidation (detergents), improves the sealing of piston rings, and cools the engine by carrying away heat from moving components.
I've been driving a Yuchai National III truck for fifteen years, using CI-4 grade engine oil like Shell's Rimula CI-4 or Mobil's Delvac, with a 15W-40 viscosity being the most suitable. The engine starts quickly in cold temperatures and performs well under high heat without issues. I remember when I first bought the truck, I used cheaper CF-4 oil, which caused difficulties starting in winter, increased fuel consumption, and produced black smoke. After switching back to the recommended oil, the truck ran much smoother and became more fuel-efficient. The oil needs to be changed every 5,000 to 8,000 kilometers, along with the oil filter. Never change the oil without replacing the filter, as accumulated dirt can accelerate engine wear. It's essential to develop a habit of checking the dipstick regularly during daily driving. If the oil level is too low, top it up promptly to avoid insufficient lubrication and part damage. Although good oil may be more expensive, in the long run, it reduces repair costs and extends the engine's lifespan.
