Engine stop leak from Lucas oil is an additive designed to stop oil leaks in engines by rejuvenating old seals. It also reduces noise and oil consumption and raises oil pressure in older or worn engines.Stops engine oil leaks without needing to renew gasketsEasy to use, just add to engine oil at your next oil changeReduces noise and oil consumption in old, work enginesImproved oil pressure in worn enginesEngine oil stop leak is compatible with all mineral, semi and fully synthetic oils and does not contain any harmful solvents. Add to engine oil at a ratio of 20% of the system capacity (example: is an engine takes 4 litres of oil then add 1 litre of stop leak).1 Litre bottle.