• Yeah be fine, but 5w30 is a bit thin imo for a car that age. Honda's of a similar vintage and newer were 10w40

    Think 5w30 might be too thin and be used by the car engine.

  • 5w30 and 10w30 will have the same viscosity when at operating temperature.

    The only difference (5w vs 10w) is the low temperature viscosity. Highly doubtful that will make a material difference.

    Oh and to the original question all oil viscosities can be combined if necessary.

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