What octane is required in a 1.8turbo voltswagon jetta?
Hi There, I own a 2001 Jetta 1.8T. The minimum octain rating information is located on the inside of the gas cap door, and I believe that minimum is 91octain. This isn't to say that you can't use 87 octain, or regular fule. Doing so however you'll notice a loss in power, and a possible engine nock. The engine nock results from when the detonation inside the cylinder is not as powerful, causing the valves to sound louder. hope this helps.
The VW Jetta and New Beetle, are manufactured at Puebla Mexico... see this link http://www.tirekick.com/TK07/VW-Puebla.htm also you may know in Mexico they continue manufacturing the Jetta A4 (re-designed) and they call it the "New Jetta", and also the Jetta A5 what they call it "Bora" The Jetta A5 "Bora" http://mx.volkswagen.com/vwcms/master_public/virtualmaster/es_mx/models/touran.html and Jetta A4 (redesigned) "New Jetta" http://www.vw.com.mx/CWE/Popups/JettaGP/start.html
Almost all the later model Volkswagen models suggest running higher octane fuel for optimal economy and performance. Especially the VR6 or W8 powerplants. I ran 92 in my 87 Jetta the whole time that I had it, and didn't have any problems out of it. The fuel filters last a little longer if you run higher test premium...