Engine Oil
Engine oils are the lifeblood of any combustion engine, reducing friction between moving parts, dissipating heat, and preventing corrosion. Modern engine oils are classified by SAE viscosity grades (like 5W-30 or 15W-40), API service categories (SP, CK-4), and ACEA specifications (C2, C3, C5). Choosing the right engine oil depends on your vehicle type, manufacturer recommendations, operating conditions, and emission system requirements. Heavy-duty diesel engines require different formulations than passenger car engines, with CK-4 oils designed for commercial vehicles and PCMO oils for passenger cars.
Key Specifications
Brands Offering Engine Oil Products
Frequently Asked Questions
What is the difference between CK-4 and SP engine oil?
CK-4 is an API category designed for heavy-duty diesel engines in commercial vehicles and equipment, while SP is the latest API category for passenger car motor oils (PCMO). CK-4 oils handle higher soot loads and provide better oxidation resistance for diesel engines, whereas SP oils focus on timing-chain wear protection and low-speed pre-ignition prevention in gasoline engines.
Can I mix different brands of engine oil?
Yes, engine oils that meet the same API and ACEA specifications are formulated to be compatible. However, mixing brands is not recommended as a regular practice because different additive packages may not complement each other optimally. If you need to top up, using the same specification is more important than using the same brand.
How often should I change my engine oil?
Oil change intervals depend on the oil type, engine design, and operating conditions. Modern synthetic oils in passenger cars typically last 10,000-15,000 km, while heavy-duty diesel engines may require changes every 500-1,000 hours. Always follow the vehicle manufacturer’s recommended intervals and adjust for severe operating conditions such as dusty environments or frequent short trips.
What do the numbers in 5W-30 or 15W-40 mean?
The first number (e.g. 5W or 15W) indicates the oil’s viscosity at low temperatures — the lower the number, the better it flows in cold starts. The second number (30 or 40) indicates viscosity at operating temperature (100°C). A 5W-30 flows more easily in cold weather than a 15W-40, while a 15W-40 provides a thicker oil film at high temperatures suited to heavy-duty diesel engines.
Find Your Engine Oil Equivalent
Use the Universal Oil Matcher to instantly cross-reference engine oil products across Shell, Mobil, Castrol, Sinopec, Valvoline, Caltex, Fuchs, Penrite, and Gulf Western.
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