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Is it ok to combine 5W30 and 10W30 in my oil system?

No, it is not recommended to combine different viscosities of oil in your oil system, such as 5W30 and 10W30. Mixing different viscosities can affect the overall viscosity of the oil and may not provide the necessary lubrication or protection for your engine. It's best to use a single viscosity of oil as recommended by your vehicle manufacturer.