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Series 3 oil generally refers to multi-grade engine lubricants that meet higher specifications, typically complying with the latest industry standards such as API SP or ILSAC GF-6. It possesses excellent high-temperature anti-wear properties, detergency, dispersibility, and oxidation resistance. In local usage scenarios, the tropical climate leads to generally higher engine operating temperatures. Series 3 oil can effectively reduce the risk of oil film rupture in high-temperature environments, providing better protection for internal engine components. It is particularly suitable for modern vehicles equipped with turbocharged and GDI (Gasoline Direct Injection) technologies—such models are gradually increasing their market share in Malaysia and place more stringent demands on lubricant performance. Additionally, Series 3 oil usually meets the original equipment manufacturer (OEM) certification requirements of major local automotive brands. For instance, some new models from brands like Proton, Perodua, Toyota, and Honda recommend using such oils, which not only extend the engine's service life but also maintain its efficient operation and reduce long-term maintenance costs. Moreover, this type of oil can better handle the engine load caused by frequent starts and stops in urban congested traffic conditions, keep the oil passages clean, minimize carbon deposit formation, and ensure more reliable power output for the vehicle.

Number 1 fuel typically refers to the most prevalent RON95 gasoline in the Malaysian market. RON95 is the predominant gasoline grade used locally. Malaysian citizens can purchase it with their national identity cards at a subsidized rate of RM1.99 per liter. This policy, effective from September 30, 2025, aims to optimize subsidy resource allocation and safeguard citizens' daily transportation costs. The government has established a monthly subsidy cap of 300 liters per citizen, with ride-hailing drivers eligible to apply for an increased quota to accommodate operational requirements. Non-citizens and foreign-registered vehicles are ineligible for the RON95 subsidy and must purchase RON95 at market price (approximately RM2.6 per liter) or opt for higher-octane RON97 gasoline (around RM3.21 per liter). RON95 gasoline is compatible with most household and standard commercial vehicles. Its widespread adoption and subsidized pricing make it one of the most favored fuel choices among local consumers.

No. 2 fuel oil is a petroleum fraction closely related to diesel, and it is one of the common fuel oil grades. It features low viscosity, high density, and high calorific value, usually appearing as a black or brown liquid with high energy content and good lubricity, but it tends to gel in low-temperature environments. It has a wide range of uses: it can be used as fuel for heating residential and commercial spaces, powering equipment such as furnaces, boilers, and water heaters; it also serves as an important energy source in the industrial sector, applied to combustion and heating equipment like industrial furnaces and power plant units; meanwhile, it is the most common diesel grade (No. 2 diesel), suitable for diesel engines in road vehicles, industrial machinery, etc. This fuel oil is produced through distillation and refining processes in petroleum refining, often blending straight-run fractions with catalytic cracking fractions. After impurities are removed via drying and filtration, antioxidants, dispersants, corrosion inhibitors, etc., are added to meet specification requirements. In terms of safety, it is a highly flammable substance, and inhalation, skin contact, or ingestion may cause toxicity. During storage and transportation, it needs to be kept away from fire sources, stored in special containers with warning signs, and operating procedures must be strictly followed to ensure safety. Additionally, it is heavier and has a higher energy density than No. 1 fuel oil in fuel classification, but its low-temperature fluidity is slightly poorer. Sometimes it is mixed with No. 1 fuel oil to improve performance in cold weather.

Number 4 fuel oil (including No.4 light and No.4 fuel oil) refers to a heavy distillate fuel oil or a blend of distillate fuel oil and residual fuel oil. Its properties are mainly determined by the nature of crude oil and processing methods, with key quality indicators including viscosity, sulfur content, and pour point. For power plant applications, vanadium and sodium content are also specified. In fuel oil classifications, No.1 and No.2 are distillate fuel oils suitable for household or small industrial burners, while No.4 falls into the category of heavy distillate or blended fuel oil. It is distinguished from residual fuel oils such as No.5 (light and heavy), No.6, and No.7, which have progressively higher viscosity and broader distillation ranges, typically requiring preheating at low temperatures for proper handling and atomization. This type of fuel oil is commonly used in applications such as large-horsepower medium-low speed power units and medium-small nozzle boilers, featuring characteristics like good combustion performance and storage stability.

#1 and #2 fuel oils usually refer to diesel grades. In the local fuel supply system, their core differences lie in viscosity, flow properties, and applicable scenarios. #1 diesel is a light-grade diesel with lower viscosity and better flow characteristics, suitable for applications requiring high fuel fluidity, such as certain high-performance diesel engines, precision industrial equipment, or specialized low-temperature environments (though the region experiences consistently high temperatures, some specific equipment may require it). #2 diesel is the more prevalent grade, featuring moderately higher viscosity and slightly greater calorific value, making it suitable for most consumer diesel vehicles, commercial vehicles, and general industrial applications. It is also more widely available at local fueling stations. Selection should adhere to the vehicle manufacturer's recommendations. For typical consumer diesel vehicles, #2 diesel suffices as it offers an optimal balance between performance and operating costs for routine use. Diesel grades supplied by licensed local fuel providers are clearly labeled, enabling users to make informed selections based on operational requirements to maintain engine efficiency and reliability.