If it will only be in the engine during the summer, use 10w30. If the oil will be in the engine during winter and you live in a place where it gets cold during these months, use 5w30 oil. At operating temperatures, both oils will have the same viscosity (30) and will flow and protect identically. The only difference between these two oils is cold flow ability: a 10w30 oil will move slower than a 5w30 oil during cold startups. A high viscosity (thicker) oil will adhere to mechanical components better when subjected to high pressure and stress and can withstand higher temperatures before thinning out beyond its working viscosity (past which it can no longer provide adequate protection). The second number, which is 30 for both of these oils, indicates the thickness of the oil once it reaches operating/high temperatures.
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