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Nulon Lead Substitute Valve Saver Upper Cylinder Lubricant 500mL - LS500 Nulon Lead Substitute Valve Saver makes unleaded petrol safe for use in all vehicles designed to run on leaded petrol. Lead Substitute uses the latest and safest potassium technology to provide unsurpassed valve and valve seat protection. Older engines with cast-iron cylinder heads can use Nulon Lead Substitute Valve Saver with unleaded petrol for an indefinite period of time to avoid costly cylinder head modifications. Lead Substitute Valve Saver provides maximum upper cylinder lubrication.