Traffic congestion has doubled in the past decade, so that today even a normal driver can stop and start upto 18000^ times a year. That s annoying, but worse, it slowly damages your engine permanently. Our breakthrough Castrol MAGNATEC DUALOCK molecules cling to critical engine parts and lock together forming an impenetrable force field of protection that dramatically reduces both warm up* and stop-start wear by 50%** Castrol MAGNATEC Non-stop protection from every start Application Castrol MAGNATEC 10W-40 is a part synthetic lubricant suitable for use in petrol cars where the manufacturer recommends API SN or earlier specification 10W-40 lubricant Specification API SN ^Global average from 50 cities, Castrol Stop-Start Index 2014 *Tested versus the sequence IV A API SN wear limit. **Tested versus the CEC OM646LA ACEA wear limits.