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Nulon Stop Leak Engine Treatment – 300ml


Formulated to reduce oil leaks and exhaust smoke. Use this product if your car: leaks oil, blows blue smoke at start-up, blows smoke on take-off from traffic lights. Nulon Engine Stop Leak can also be used in gearboxes and differentials.

SKU 1144 Category


Nulon Engine Stop Leak reduces annoying oil leaks in all petrol, diesel and LPG engines. Use this product if your car has any of the following symptoms: loses or leaks oil, blows blue smoke at start-up, on take-off after a period of idling at traffic lights, or when decelerating downhill.

NOTE: Can be used to control leaks in manual gearboxes and differentials.


  • Reduces oil leaks
  • Rejuvenates hardened or shrunken seals
  • Reduces exhaust smoke at start-up or on take-off
  • Reduces oil consumption & oil burning
  • Can save the expense of seal replacement
  • Reduces leaks in all types of gearboxes & differentials

Directions for use

Add 1 bottle for every 5 litres of engine oil. Shake bottle and add contents to engine oil. Idle engine for at least 1 minute. Use with every oil change. To reduce gearbox and diff oil leaks, add 60 ml per litre of oil.

NOTE: It may take 14 days or 500 km to achieve maximum benefits. Excessively worn or damaged seals may not respond and will require replacement.

MSDS Download

Additional information

Weight 1 kg