SHELL HELIX ULTRA ECT 5W30 6L FULLY SYNTHETIC ENGINE OIL. ACEA C3; API SN. Shell Helix Ultra ECT C3 uses advanced emissions-compatible technology (ECT) to help protect the vehicles emission system. It is formulated using Shell’s unique PurePlus Technology, a breakthrough process converting natural gas into a crystal-clear base oil with virtually none of the impurities found in crude oil.
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