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How to Choose the Best Engine Oil for Cars, Trucks, and Marine Vessels

How to Choose the Best Engine Oil for Cars, Trucks, and Marine Engines

1. Key Functions of Engine Oil

Lubrication: Reduces friction between moving metal parts.

Cooling: Dissipates heat from high-temperature zones like pistons.

Cleaning: Keeps sludge, soot, and combustion residues suspended.

Sealing: Forms a sealing film between piston rings and cylinder walls.

Anti-corrosion: Neutralizes acids and protects against rust and oxidation.

2. How to Choose Engine Oil Based on Vehicle Type

For Passenger Cars (Gasoline/Diesel)

Recommended oil: Fully Synthetic or Semi-Synthetic

Viscosity grades: 0W-20, 5W-30, 5W-40

Standards: API SP/SN+, ILSAC GF-6, ACEA A5/B5

DENIS OIL Suggestion: DNS 5W-30 Fully Synthetic API SP

For Trucks, Buses, Construction Equipment (Heavy-Duty Diesel)

Recommended oil: High TBN Mineral or Semi-Synthetic

Viscosity grades: 15W-40, 20W-50

Standards: API CI-4/CJ-4/CK-4, ACEA E7/E9

DENIS OIL Suggestion: HDX 15W-40 CI-4 with high thermal stability

For Marine Diesel Engines

Recommended oil: SAE 30/40 or 15W-40 with TBN 12–40

Standards: API CF/CF-2, Marine OEMs

DENIS OIL Suggestion: Marine SAE 40 CF-2 TBN 20

3. Synthetic Oil vs. Mineral Oil – Which is Better?

Feature	Mineral Oil	Fully Synthetic Oil
Purity	Less refined	Highly refined molecules
Lubrication	Standard	Excellent, even in small gaps
Heat resistance	Limited	High oxidative stability
Oil life	~5,000 km	Up to 15,000 km
Cost	Low	2–3 times higher, more effective

Use synthetic oil for modern engines or harsh conditions.
Use mineral oil for older engines with basic needs.

4. When to Change Oil and Oil Filter

Vehicle Type	Oil Change Interval	Oil Filter Change
Cars	6,000–10,000 km or 6 months	Every 2–3 oil changes
Trucks	5,000–7,000 km	Every 2 oil changes
Marine Engines	5,000–10,000 km or by engine hours	Follow OEM recommendations

DENIS OIL – Professional Lubricant Solutions for All Engines

High-performance engine oils made in Vietnam from imported base oils (Group II/III) and premium additives from the USA and Europe. Trusted by professional users nationwide.