Castrol GTX Full Synthetic 5W-20 motor oil provides maximum protection to help fight the impact of severe conditions that can potentially shorten engine life. Tough driving conditions like idling on congested highways and frequent, short trips put peak loads on critical engine parts and create engine wear.  Environmental factors like heat can lead to sludge, varnish and carbon build-up in your engine. Castrol GTX Full Synthetic dramatically reduces engine wear. Plus it cleans away old sludge*, protects against new sludge formation better than required by the latest industry standard.
* When tested in engines with a high level of sludge