Mobil Delvac technology helps maximise the life of diesel engines and meets euro 5 emission standards. uel represents a large proportion of commercial vehicles operating costs. The Mobil Delvac range of synthetic oils, synthetic gear oils and greases have the potential to offer fuel economy advantages versus conventional lubricants. Mobil Delvac synthetic oils are designed to lubricate and protect modern low emission diesel engine design and engine exhaust. Our synthetic lubricants are more stable at high temperatures. That means they have better resistance to thermal degradation, which can lead to performance sapping sludge, deposit build up and viscosity breakdown. Mobil Delvac synthetic oils offer long drain performance, saving you time and money. Synthetic oils provide a variety of benefits that keep your engine running at optimal performance for years.