Here’s a helpful write-up on — covering what it is, key specs, common applications, performance characteristics, and maintenance tips. Astra 1.8 Turbo: What You Need to Know The Astra 1.8 Turbo typically refers to the turbocharged 1.8-liter engine found in certain Opel/Vauxhall Astra models (primarily the Astra H and Astra J generations, depending on market), as well as in some GM/Opel family vehicles. It’s part of GM’s Family 1 engine series (often the Z18XER or A18XER with turbo modifications, though many “1.8 Turbo” Astras are actually the 1.6 Turbo in some markets — so always verify your specific model).