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Under high-temperature climates, it is recommended to choose engine oils with higher high-temperature viscosity to ensure stable lubrication performance in hot environments. For Malaysia's typical tropical climate, synthetic oils such as 5W-40 or 10W-40 are preferable choices, as they maintain sufficient oil film strength at high temperatures and effectively reduce engine wear. Turbocharged models, which operate at higher temperatures, should prioritize fully synthetic oils like 0W-40 or 5W-40, as their high-temperature-resistant additives can withstand extreme operating conditions. Naturally aspirated engines may consider 5W-30 or 10W-30 viscosity grades, provided they meet API SN or SP standards to ensure oxidation resistance. Notably, Petronas Syntium series' 0W-30 and 5W-30 variants utilize CoolTech technology to enhance oil film strength and dissipate heat, making them particularly suitable for high-temperature applications. When selecting oil, always adhere to the viscosity specifications in the vehicle manual and verify the SIRIM certification mark to comply with Malaysia's upcoming 2025 mandatory lubricant certification standards. For high-mileage vehicles, upgrading to 10W-50 viscosity may help compensate for engine component wear.

Regarding the question of whether higher viscosity oil should be used in older engines, a comprehensive judgment must be made based on the vehicle's condition and operating environment. If the vehicle has exceeded 100,000 kilometers and exhibits issues such as slight oil burning, increased cold-start noise, or reduced power, upgrading to 5W-40 fully synthetic oil can enhance high-temperature protection, improve sealing, and reduce oil consumption—this is particularly suitable for German turbocharged models or vehicles operating in prolonged high-temperature environments. However, if the engine is in good condition with no abnormalities, arbitrarily increasing viscosity will instead elevate running resistance, leading to higher fuel consumption and sluggish power response. Fully synthetic oil, with its superior shear resistance and cleaning capability, remains the optimal choice for maintaining older vehicles. Note that turbocharged models must comply with original manufacturer certification standards (e.g., VW 502.00), while China 6-compliant vehicles should prioritize low-ash formulations to prevent particulate filter clogging. It is advisable to regularly monitor oil consumption, replace oil every 8,000 to 10,000 kilometers, and adhere to the manufacturer's recommended viscosity in the vehicle manual, adjusting the viscosity grade only when evident wear symptoms occur.

When using 5W-40 engine oil as a substitute for 5W-30, attention should be paid to the impact of their high-temperature viscosity difference on the engine. The kinematic viscosity of 5W-30 at 100°C is 9.3-12.5 mm²/s; it forms a thinner oil film with better fluidity, making it suitable for new vehicles or precision engines. It can reduce fuel consumption by approximately 3%-5% and enhance cold-start performance. In contrast, 5W-40 has a viscosity of 12.5-16.3 mm²/s, forming a thicker oil film with superior high-temperature stability. This makes it suitable for high-load driving conditions, turbocharged models, or older vehicles with over 80,000 kilometers mileage, as it helps reduce engine noise and compensates for wear gaps. Using 5W-40 in non-high-temperature environments or new vehicles may increase fuel consumption by 0.3-0.5 L/100km and result in higher cold-start resistance. Prolonged use could potentially affect the responsiveness of variable valve timing systems. It is advisable to follow the manufacturer's recommended oil grade as priority. German vehicles or those frequently driven at high speeds may consider 5W-40, while new Japanese/Korean vehicles or urban commuters are better suited for 5W-30. Incorrect selection may lead to issues such as inadequate lubrication or abnormal oil pressure.

High-viscosity engine oil is not always better; its applicability needs to be comprehensively judged based on the vehicle model, driving conditions, and climate factors. High-viscosity engine oils (such as 5W-40 or 10W-40) can form a thicker oil film under high-temperature or high-load operating conditions, enhancing sealing performance and anti-wear ability, making them suitable for high-performance vehicles or vehicles that frequently operate at high speeds. However, their low-temperature fluidity is poorer, and delayed lubrication during cold starts may exacerbate wear. Additionally, they increase engine operating resistance, leading to higher fuel consumption. For instance, while Petronas 5W-40 excels in high-temperature protection, its use in precision-designed modern engines (such as most Japanese vehicles) may impair fuel efficiency due to excessive viscosity. Conversely, low-viscosity engine oils (such as 0W-20 or 5W-30) provide faster component lubrication and reduced fuel consumption, making them more suitable for daily commuting or moderate driving. When selecting engine oil, priority should be given to the viscosity grade recommended in the vehicle manual, with consideration for climate conditions (e.g., in tropical regions, oils with higher high-temperature viscosity may be preferable). Products like the Petronas Syntium series offer multiple viscosity options, balancing cleanliness and anti-wear properties, but the core principle remains "matching requirements" rather than blindly pursuing high viscosity.

In the engine oil viscosity grading system, 20W50 has a higher high-temperature viscosity than 5W30. The number before the "W" in the oil grade represents low-temperature fluidity (both 5W and 20W are suitable for low-temperature environments, but 20W has slightly inferior cold-start performance compared to 5W), while the number after the "W" indicates high-temperature viscosity—the larger the value, the thicker the oil film and the better the sealing performance. Specifically, 5W30 has a high-temperature viscosity range of 9.3-12.5, making it suitable for daily commuting or newer engines; 20W50 has a significantly higher high-temperature viscosity, providing superior high-temperature protection for older engines or high-temperature heavy-duty operating conditions, but it increases frictional resistance and leads to higher fuel consumption. When selecting oil, always follow the vehicle manufacturer's recommendations: new cars or precision engines should use low-viscosity oil to optimize fuel efficiency, while high-mileage or high-performance engines may require high-viscosity oil for enhanced wear protection. Note that overfilling engine oil will reduce power output and may cause oil burning issues.