Fully synthetic engine oil - Shell's highest level of protection for exhaust gas after-treatment systems. Guarantee your engine superior performance and protection with the advantages offered by Shell Helix Ultra ECT C2 / C3 0W-30: our most advanced formulation ever. The latest addition to our range of high quality fully synthetic oils has proven to offer the best performance ever. Shell Helix Ultra ECT C2 / C3 was designed with our Emissions Compatible Technology (ECT), to help keep the latest diesel and petrol engines free of dust and deposits. Our best ever formulation has achieved exceptional test results, demonstrating excellent piston cleaning, fuel economy and unbeatable protection against wear and corrosion. Shell Helix Ultra ECT C2 / C3 combines PurePlus technology with high-performance additives, guaranteeing an even higher level of cleanliness and protection.