Three out of four Brits don’t know how to check the oil in their car, according to new research from Mobil 1. Almost half of the drivers questioned were oblivious as to why oil is even used in their vehicle’s engines. Mobil 1 is currently helping consumers stay on top of engine maintenance by offering a Save Fuel With Mobil 1 £10-off price when purchasing five-litre packs of Mobil 1 ESP Formula 5W-30 in selected Esso forecourts.