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10W30 – While still quite "fluid", this oil is a little bit thicker at low temperatures than 5W30, making the process of starting your engine a little bit harder It is recommended for use at 25°C up to 35°C (outside temperature) It is thicker, less fuelefficient and provides better sealing actionSo, that means when you are comparing 5w30 vs 10w30, the thinner 5w30 will circulate quicker, and flow through bearing tolerances better during an engine startup in the winter or colder climates The "w" behind the five and the 10 indicates that those are the viscosities in colder or winter temperaturesThis usually meant using a 5W30 oil in the fall and winter and a 10W30 in the spring and summer A multiviscosity oil, on the other hand, uses special additives to improve the viscosity of the oil Called, ironically, viscosity improvers, these additives expand as the oil heats up, providing a higher viscosity at warmer temperatures Comfortable 10w30 Vs 10w40 Ideas Luxury 10w30