Shell PurePlus Technology, the result of 40 years of scientific development, is a revolutionary gas-to-liquids process that converts natural gas into a crystal-clear synthetic base oil that is 99.5% pure. Shell Helix Ultra with PurePlus Technology is formulated to deliver even higher levels of cleansing and protection than before against build-up of engine deposits. The new engine oil provides superior wear and corrosion protection[1], and helps to extend engine life and reduce maintenance costs.