Slick 50 Engine Treatment is a unique formula for all new or old petrol and diesel engines, including vehicles with turbo chargers and catalytic converters, that helps to extend engine life. Slick 50 Engine Treatment gives durable protection during successive oil changes, during tough stop/start driving, high temperature and high stress conditions thereby lowering the risk of costly engine repairs, re-builds and breakdowns. For engines up to 1400cc Features: - Helps protect against friction and heat - Sustains optimum performance - Extends engine life - Treats the engine not the oil - Laboratory tested, road proven - Compatible with all mineral & synthetic engine oils Directions for Use Pour directly into engine. Do not overfill. If carrying out a full oil and filter change, drain oil and fit new filter. Refill with appropriate Granville engine oil, replacing 500ml of oil with the entire 500ml contents of Slick 50 Engine Treatment. Run the engine then re-check the oil level and top up with Granville engine oil if necessary. Dosage Information Contents of 500ml Slick 50 Engine Treatment will treat up to 1400cc engines. Re-treat after 20,000km. Re-treating after shorter intervals will not harm your engine