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  5. 10W-40

10W-40

If your car needs a 10W-40 engine oil Castrol offers a range of options that flow like a 10 Weight oil when the engine is cold and a 40 Weight oil when up to normal operating temperature.

10W-40

Choose the best 10W-40 oil for your engine

Castrol offers a broad range of 10W-40 engine oils, including  premium full synthetic, high mileage and conventional, meeting the needs of both drivers and vehicle manufacturers.


Castrol EDGE, an advanced full synthetic 10W-40 motor oil, is Castrol’s strongest oil and a great option for those who want the very best for their car. Castrol GTX MAGNATEC is a premium full synthetic 10W-40 that offers superior wear protection. If your car has over 75,000 miles on the odometer, Castrol GTX High Mileage 10W-40 can help protect your emission system while helping to extend the life of your engine. Castrol GTX 10W-40 Double-Action formula has been engineered to clean away old sludge while preventing new sludge formation.

Castrol MAGNATEC 10W-40

Castrol MAGNATEC 10W-40

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%**

^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.