Bengaluru:Global lubricant giant Castrol on Monday announced the launch of Castrol GTX Ultraclean, promising to keep car engines 50 percent cleaner. "The modern world creates difficult challenges for cars with heat, tough driving conditions and combustion contaminants - all of which can lead to sludge formation which potentially shortens engine life," said Castrol about the new lubricant which addresses the problems. According to Castrol, sludge deposits build up in vital oil-ways and can prevent oil from protecting the engine. Castrol GTX Ultraclean is a part synthetic 5W-30 viscosity engine oil for petrol cars. Part of the BP Group, Castrol sells products in 140 countries in automotive, marine, industrial and energy production sectors.