Purpose and Specifications

WOLF GUARDTECH 15W40 SL/CF is a high-quality mineral engine oil designed for both gasoline and diesel engines in passenger cars and light trucks. This universal oil works in mixed fleets where different fuel types operate together, making it practical for workshops and fleet operators managing varied vehicles.

The 15W40 viscosity grade means the oil flows easily when your engine is cold (winter starts at -20°C) while maintaining a protective film at normal operating temperatures (around 100°C). This balance protects your engine during cold mornings and hot highway driving.

Key protective features:

• Cleans engine deposits and neutralizes acids that form during combustion
• Reduces wear on engine parts through strong lubrication
• Handles extended oil change intervals without breaking down
• Meets major OEM requirements: FIAT, Mercedes-Benz, PSA, and Volkswagen specifications

The oil meets API SL and API CF standards, covering both gasoline and diesel engine protection. It also exceeds ACEA A3/B4-08 requirements, ensuring compatibility with modern emission systems.

When to Use / Replace?

Replacement interval: Follow your vehicle manufacturer's recommendation, typically 10,000 to 15,000 km or every 6-12 months, whichever comes first. Check your owner's manual for exact intervals—some modern engines allow longer periods.

Best for: Gasoline engines (including turbocharged), diesel engines, and vehicles operating in severe conditions with high engine loads. Suitable for both city driving and highway use.

Storage: Keep unopened containers in a cool, dry place. Mineral oil typically maintains quality for 3-5 years when stored properly away from direct sunlight.

Operating temperature range: Protects engines from -20°C (cold start) to approximately 100°C (normal operating temperature).

Frequently Asked Questions

Q: Can I use this oil in my diesel truck and gasoline car?
A: Yes. GUARDTECH 15W40 SL/CF is specifically formulated as a universal oil for mixed fleets. It meets protection standards for both fuel types, so one product works across your vehicles.

Q: Is this mineral oil or synthetic?
A: This is a mineral oil, which is more affordable than synthetic but requires more frequent changes. It's ideal if you prefer budget-friendly maintenance without sacrificing engine protection.

Q: Will this oil work in my Volkswagen or Mercedes?
A: Yes. This oil meets VW 501.01, VW 505.00, and MB 229.1 specifications, so it's approved for these brands. Always verify your specific model's requirements in your owner's manual.