In global markets, quality lubricants are key to engine performance and longevity. For distributors and trading companies in Southeast Asia, Africa, the Middle East, South America, and Central Asia, multigrade oils like 5W-40 are especially important. The “5W-40” label follows the SAE multigrade system: the “5W” indicates winter (cold-weather) viscosity grade and “40” indicates high-temperature viscosity grade.In practice, this means 5W40 engine oil flows like a SAE 5-weight oil at low temperatures and behaves like a SAE 40-weight oil at high temperatures. This dual rating ensures reliable cold starts and strong protection at operating temperature – ideal for diverse climates and heavy-duty use. As the Oil-Store technical guide explains, “the number before the ‘W’ indicates viscosity… at low temperatures, and the number after the ‘W’ denotes viscosi at higher temperatures”.
In short, 5W-40 engine oil is formulated to maintain a thicker oil film in hot conditions while still pumping easily when cold, making it a versatile choice for many engines.
1.Difference Between 5W-30 and 5W-40 Engine Oil
The primary difference between 5W-30 and 5W-40 lies in their high-temperature viscosity and performance. Both grades share the same low-temperature “5W” rating, so they flow similarly when the engine is cold. However, at operating temperature, 5W-40 has a higher viscosity. Technical data show the kinematic viscosity of 5W-40 oil at 100 °C is about 12.5–16.3 mm²/s, whereas 5W-30 is about 9.3–12.5 mm²/s.
In practice this means 5W-40 oil maintains a thicker film when hot. As Oil-Store explains, both oils “are grade five when cold, however 5W-30 becomes 30 grade and 5W-40 becomes 40 grade under operating temperatures. In higher temperatures, 5W-40 has higher viscosity levels than 5W-30, which can contribute to uninterrupted engine function”
This difference affects engine protection and fuel economy: 5W-30, being lighter at high temperature, flows more easily for fuel efficiency, while 5W-40 provides greater film strength under load.
For example, 5W-40 oils have a broader operating range (roughly −25 °C to 35 °C) compared to 5W-30 (−25 °C to 25 °C), making 5W-40 better suited to very hot climates or heavy duty use. Conversely, 5W-30 can be slightly better for fuel economy in milder conditions. In summary, is 5W40 thicker than 5W30? Yes – at high engine temperatures, 5W-40 is significantly more viscous, providing added protection in high-heat scenarios.
2.Choosing 5W30 or 5W40 for High-Mileage Engines
For older or high-mileage engines, it is especially important to choose the right oil. Many experts say that 5W-30 is often recommended for engines that have been used a lot because it can flow more easily through parts that are worn. However, 5W-40’s extra thickness under heat can also help maintain pressure on worn components. Industry analysis shows that “5W-30 engine oil can be used by many types of vehicles and is especially good for cold temperatures. It is used more often in engines that have been driven more, and it works better in warmer temperatures.
In practice, a distributor should check how a vehicle is used: if engines run mainly in stop-and-go traffic or mild climates, 5W-30 may be enough, whereas 5W-40 is better for hot weather or heavy loads. In every case, advise customers to follow OEM guidelines and consider local conditions.”
In practice, what is 5W-40 oil used for? It is the go-to choice for modern gasoline and diesel engines that face hot climates or heavy workloads. Light-duty passenger cars in cold regions might only need 5W-30, but fleets in Africa or the Middle East often switch to 5W-40 during summer. Distributors can highlight that 5W-40 provides a thicker lubricating film under heat, which helps prevent metal-to-metal contact, engine knock, and oil breakdown. It also helps engines maintain oil pressure and performance in cities with stop-start traffic. This makes 5W-40 attractive for taxi fleets, delivery trucks, and other high-mileage applications.
3.TERZO 5W-30 and 5W-40: Quality Oils for Global Markets
Our TERZO brand offers premium 5W-30 and 5W-40 engine oils designed for global markets. Both TERZO 5W-40 engine oil and TERZO 5W-30 engine oil meet international API and ACEA specifications, ensuring compatibility with a wide range of vehicles. For distributors and agents, TERZO products represent a competitive offering for regions in need of reliable lubricants. You can confidently recommend TERZO oils knowing they have the proper viscosity characteristics: TERZO 5W-40 is optimized for high-temperature stability and load protection, while TERZO 5W-30 delivers efficient flow in cooler conditions and better fuel economy.
The wide ambient ranges in Asia, Africa, Latin America and beyond are addressed by carrying both grades. For instance, a customer in Central Asia might stock TERZO 5W-30 for winter and switch to TERZO 5W-40 for summer. Promoting TERZO oils in your catalog allows you to meet diverse needs. Additionally, TERZO’s technical support and testing services (e.g. viscosity analysis) help agents advise end-users properly. Offering TERZO lubricants also means access to marketing collateral and sales incentives for bulk orders – an advantage when pitching to large fleet operators or government tenders.
4.Business Opportunities and Next Steps
The growing automotive and industrial sectors in target regions create strong demand for high-quality engine oils. By supplying TERZO 5W-40 engine oil (as well as TERZO 5W-30) to Southeast Asia, Africa, the Middle East, South America, and Central Asia, partners can capitalize on this trend. These markets particularly value products that improve engine longevity and efficiency under harsh conditions. Emphasize that TERZO oils combine modern synthetic additives with proven performance – a compelling selling point.
To explore partnership, distribution, or bulk purchasing options, please contact us or visit our Services page. We offer competitive pricing, reliable logistics support, and dedicated account management for our global agents. Let us help you grow your business by adding TERZO 5W-40 and 5W-30 oils to your portfolio. With the right engine oils, your customers’ vehicles will run smoother and last longer – creating repeat business and trust in your brand.
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