PTT Seatech Lubricant 5000, 6000, 6500 – The Ultimate Choice for Marine Engines

09/10/2025

Detailed analysis of three Seatech lubricant lines – 5000, 6000, and 6500 – produced by PTT Lubricants Thailand. Compare their features, applications, and how to choose the right type for different marine engines.

Choosing the right marine engine oil can be a challenging task. This article introduces three Seatech lubricant lines – 5000, 6000, and 6500, explaining their unique characteristics, technical specifications, and ideal applications. Let’s find out which Seatech product best fits your engine’s needs.

1. General Introduction to Seatech Lubricant

PTT Seatech Lubricants - Source: SIAM Brothers Vietnam

In the marine industry, selecting the right lubricant is crucial—it directly impacts performance, engine lifespan, and operating costs. Among specialized marine lubricants, Seatech, developed by PTT Lubricants (Thailand), stands out thanks to its advanced additive technology, superior protection, and consistent durability even in harsh conditions.

The three main product lines – Seatech 5000, Seatech 6000, and Seatech 6500 – are tailored for different operating needs, from small coastal fishing boats to large offshore vessels and high-capacity engines.

2. Features and Technical Specifications of Each Seatech Line

2.1. Seatech 5000 – Cost-Effective and Efficient

Standard: API CF-4

Application: Small to medium diesel engines, nearshore fishing boats.

Key Features:

Excellent protection against wear and corrosion.
Keeps the engine clean and minimizes sludge formation.
Suitable for oil change cycles of 25–30 days or about 600 operating hours.

PTT Seatech Lubricants
PTT Seatech 6000 Lubricants - Source: SIAM Brothers Vietnam

Technical Specifications:

Indicator	Method	Value
Kinematic viscosity at 40°C (cSt)	ASTM D445 – 15A	≥105
Kinematic viscosity at 100°C (cSt)	ASTM D445 – 15A	18.3–19.3
Density at 15°C (g/cm³)	ASTM D4052 – 16	0.89
Viscosity index (VI)	ASTM D2270 – 01	>110
Flash point (°C)	ASTM D92 – 16	Min 215
Pour point (°C)	ASTM D5950 – 14	Max –12

2.2. Seatech 6000 – Balanced Performance and Durability

Standard: API CH-4, CG-4, CF-4, ACEA E7, VOLVO VDS-3, MAN 3275
Application: Medium to large fishing vessels operating for extended periods offshore.

Key Features:

Superior lubrication reduces friction and wear.
High thermal stability and excellent oxidation resistance.
Improves fuel economy and extends engine life.
Oil change cycle: 30–40 days or approximately 800 operating hours.

PTT Seatech Lubricants
PTT Seatech 6000 Lubricants - Source: SIAM Brothers Vietnam

Technical Specifications:

Indicator	Method	Value
Kinematic viscosity at 40°C (cSt)	ASTM D445 – 15A	≥105
Kinematic viscosity at 100°C (cSt)	ASTM D445 – 15A	18.3–19.3
Density at 15°C (g/cm³)	ASTM D4052 – 16	0.878
Viscosity index (VI)	ASTM D2270 – 01	>110
Flash point (°C)	ASTM D92 – 16	Min 215
Pour point (°C)	ASTM D5950 – 14	Max –12

2.3. Seatech 6500 – Maximum Protection for Heavy-Duty Engines

Standard: API CI-4, MB 228.3, VOLVO VDS-3

Application: High-pressure diesel engines, cargo vessels, or large fishing boats running continuously.

Key Features:

Enhanced anti-wear additives minimize salt and oxidation damage.
Maintains stable viscosity under high load and heat.
Reduces maintenance costs with extended oil change cycles (40–50 days or ~1000 hours).

PTT Seatech Lubricants
PTT Seatech 6500 Lubricants - Source: SIAM Brothers Vietnam

Technical Specifications:

Indicator	Method	Value
Kinematic viscosity at 40°C (cSt)	ASTM D445 – 15A	≥105
Kinematic viscosity at 100°C (cSt)	ASTM D445 – 15A	18.3–19.3
Density at 15°C (g/cm³)	ASTM D4052 – 16	0.8801
Viscosity index (VI)	ASTM D2270 – 01	>110
Flash point (°C)	ASTM D92 – 16	Min 215
Pour point (°C)	ASTM D5950 – 14	Max –12

3. Comparison Between the Three Seatech Lines

Criteria	Seatech 5000	Seatech 6000	Seatech 6500
API Standard	CF-4	CH-4	CI-4
Lubrication Performance	Good	Very Good	Excellent
Detergency & Anti-Sludge	Basic	High	Very High
Thermal & Oxidation Stability	Moderate	Good	Excellent
Engine Protection Level	Basic	Comprehensive	Advanced
Recommended Oil Change Cycle	600 hours	800 hours	1000 hours
Suitable Engine Type	Small fishing boats	Offshore fishing boats	Large vessels, cargo ships
Investment Cost	Economical	Balanced	Higher, but longer lasting

PTT Seatech Lubricants
PTT Seatech Lubricants - Source: SIAM Brothers Vietnam

4. Q&A – Frequently Asked Questions

Q1: Can Seatech be used for trucks or industrial machines?
→ Yes. Especially Seatech 6000 and 6500, which meet API CI-4 standards suitable for heavy-duty diesel engines.

Q2: When should Seatech oil be changed?
→ Every 250–350 operating hours or as recommended by the engine manufacturer.

Q3: Can Seatech be mixed with other oils?
→ Not recommended, as it may affect additive stability and lubrication performance.

Q4: What are the signs that the oil needs replacement?
→ Engine overheating, increased noise, black exhaust smoke, or darkened oil color.

5. Official Distributor of Seatech Lubricants in Vietnam

PTT Seatech Lubricants - Source: SIAM Brothers Vietnam

Seatech Lubricant is exclusively distributed in Vietnam by Siam Brothers Vietnam JSC, a reputable enterprise with over 30 years of experience in the maritime and fisheries industry.

All products are imported directly from PTT Lubricants (Thailand) with clear CO-CQ certification, ensuring authentic quality, verified origin, and international performance standards.

Contact Information:

Website: https://siambrothersvn.com
Hotline: 1800 6129 (toll-free)
Address: 5th Floor, VRG Building, 177 Hai Bà Trưng, Xuân Hòa Ward, Ho Chi Minh City, Vietnam.
Policy: Nationwide delivery – On-site technical consultation – Scheduled maintenance support.