Ecotec

An engine made by Opel with the model number X18XE1. There is ECOTEC inscribed on the top of the engine.
Opel X18XE1 EcoTec engine

Ecotec (capitalized ECOTEC, from "Emissions Control Optimization TEChnology") is a General Motors (GM) and Opel Automobile GmbH (Opel) trademark that refers to a series of emissions technologies that were implemented throughout a range of GM engines. ECOTEC can refer to the following diesel and petrol engines originally produced by General Motors:

The trademark ECOTEC has also been used on Opel automobiles which are powered by the following engines produced by PSA PowerTrain: