Purpose and Specifications

MA PROFESSIONAL Stop Leak 300ML is an engine oil additive designed to stop minor oil leaks and reduce excessive engine smoke in both petrol and diesel engines. This product works by restoring the elasticity of worn rubber seals and gaskets, particularly around valve stem seals and valve cover gaskets—the source of approximately 80% of all engine oil leaks.

Key Benefits:

• Stops and prevents minor oil leaks from deteriorated seals and gaskets
• Reduces blue or white exhaust smoke caused by oil burning
• Safe for all petrol and diesel engines
• Works with all motor oil types and grades
• Helps extend engine life and avoid costly repairs
• Maintains proper engine lubrication while sealing

How It Works: The additive contains special components that soften and restore flexibility to hardened rubber seals. When mixed with your engine oil, it circulates through the engine and gradually conditions seals to eliminate leaks. Full sealing typically occurs after 600–800 km of normal driving, though some improvement may be visible within 20 minutes of driving.

When to Use / Replace?

When to Apply:

• When you notice oil spots under your parked vehicle
• When your engine produces blue or white smoke from the exhaust
• During routine oil changes for preventative maintenance on older or high-mileage engines
• On vehicles showing signs of wear (typically 80,000+ km)

Application Instructions:

• Pour the 300ML bottle into your engine oil after an oil change or directly into the oil filler cap
• Ensure the engine is cool before adding
• Drive normally for at least 20 minutes to allow circulation
• Check oil level and top up if necessary
• Reapply with each oil change for continuous protection

Expected Results Timeline: Initial improvement within 20 minutes of driving; noticeable sealing within 600–800 km or 1–2 weeks of normal use. For best results, use at every oil change.

Storage & Shelf Life: Store in a cool, dry place. Typical shelf life is 3–5 years when unopened and stored properly.

Frequently Asked Questions

Q: Will this additive damage my engine or seals?
A: No. Unlike harsh stop-leak products, MA PROFESSIONAL Stop Leak is formulated to be gentle on engine components. It maintains essential lubrication properties and is safe for all gasoline and diesel engines without harmful chemicals.

Q: How much oil does one 300ML bottle treat?
A: A 300ML bottle is designed for engines with oil capacities up to approximately 5–6 liters. For larger engines, you may need to adjust the dosage proportionally or use multiple bottles.

Q: Can I use this if my engine is already leaking badly?
A: This product is designed for minor oil leaks caused by worn seals and gaskets. Severe leaks from cracked engine blocks, damaged gaskets, or loose drain plugs require mechanical repair. If leaks are significant or accompanied by overheating, consult a mechanic.