Purpose and Specifications

Comma Classic 40 is a high-viscosity mineral engine oil designed specifically for older and classic vehicles. This SAE 40 grade oil provides robust protection for engines with larger tolerances and simpler designs that were common in vintage automobiles.

The oil works by creating a thick, stable protective layer around engine components even at high temperatures. Its high viscosity prevents oil leakage through worn seals and gaskets—a common issue in older engines—while also reducing engine noise and wear on internal parts.

Key Benefits:

• Minimizes oil leaks in engines with worn seals and gaskets
• Reduces engine noise and clatter
• Protects older engine designs with larger bearing clearances
• Maintains stable protection at high operating temperatures (up to 100°C+)
• Low detergent formula safe for older filtration systems (mesh strainers and gauze filters)

When to Use / Replace?

Ideal For: Classic cars, vintage motorcycles, older tractors, and any pre-1980s engine where the manufacturer recommends SAE 40 or equivalent mineral oil.

Replacement Schedule: Change oil every 3,000–5,000 km or every 3–6 months, whichever comes first. Classic vehicles driven seasonally may need oil changes annually before storage.

Operating Temperature Range: Suitable for year-round use in temperate climates. In very cold winters (below -10°C), consider switching to a lighter grade like SAE 30 for easier cold starts.

Shelf Life: Unopened containers remain stable for 2–3 years when stored in cool, dry conditions away from direct sunlight.

Frequently Asked Questions

Q: Can I use Comma Classic 40 in modern cars?
A: No. Modern engines require multigrade oils (like 5W-40) that flow at cold temperatures and meet current emission standards. Using SAE 40 in a new car will cause poor cold-start performance and may damage the engine.

Q: Why is this oil better than modern synthetic oils for my classic car?
A: Older engines have larger gaps between moving parts and were designed for mineral oil. Modern synthetic oils with high detergents can cause leaks in vintage engines by cleaning away deposits that seal worn components. Comma Classic 40's low-detergent formula is gentler on aged seals.

Q: What's the difference between SAE 40 and 20W-50?
A: SAE 40 is a single-grade oil that stays thick at all temperatures—ideal for summer driving or engines in warm climates. 20W-50 is a multigrade that flows better in winter (the 20W part) but thickens to 50-weight protection when hot. Choose based on your climate and the manufacturer's recommendation.