It’ll need topping up with AdBlue solution at intervals, but the trade-off is a reduction in nitrous oxide emissions. Massimiliano Sala, Opel/Vauxhall’s global assistant chief engineer for diesel engines, talked us through the new engine’s highlights, which include an aluminium cylinder head and a plastic manifold, both of which help to dampen noise considerably, and a new balancer shaft to smooth things over.Īpart from being quieter and smoother, the Whisper engine has the more prosaic function of meeting stricter Euro 6 emissions regs. ![]() It’s an almost totally new engine compared with the old 2.0-litre diesel unit it succeeds, and one that’s vital for the company car habitat the Insignia inhabits. What’s so significant about the Whisper diesel engine?
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