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10w30 vs 10w40 Differences in Engine Oil Viscosity Two of the most common viscosities used in modern car engines are 10w30 and 10w40 While the first part of By Car Bibles Staff November 28, 18 WrenchingActually Ive bought two types of engine oil 4Liter Shell Helix 5W40 4Liter Shell Helix W50 what should I use?10W40 Oil instead of 5W40 Just had oil changed at a local place, and noticed on the bill that the oil was 10W40 rather than the 5W40 that the car normally has Car is a 01 Mk3 Mondeo (Duratec engine, 90k miles) Will this cause any problems or is it ok I change the oil every 6000 miles Thanks, Yoby Engine Sound Hp Test Mtul 5w 40 Vs Shell 10w 60 Synthetic Racing Oil Shell Helix Ultra Racing Youtube 5w-40 vs 10w-40 car