Isuzu Circle L V6 (Y30DT)

Isuzu's 3.0 V6 diesel — the Circle L — sold by Opel and Vauxhall as the Y30DT, the 3.0 V6 CDTi.

⚑ It is an Isuzu engine in a Vauxhall, and that is the whole reason to know its real name: searching Y30DT finds a handful of forum posts, and searching Isuzu finds the engineering. General Motors owned a large stake in Isuzu when the Vectra C was designed, which is the explanation.

A V6 diesel is rare and the packaging is the consequence — it fills the Vectra's bay completely, and jobs that are routine on the four-cylinder CDTi are not routine here.

Its known items are the ones a common-rail V6 of this age would have: injectors, the turbochargers, and swirl flaps in the intake. Everything is doubled because there are two banks, which affects both diagnosis and cost.

It was not sold for long and specialist experience is thin. The opel-cdti-* four-cylinder pages here cover different engines entirely.