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Newer engines are machined to tighter specifications than older motors. Newer motors require a lighter grade oil for lubrication like a 5 or 10 weight. The 5 or 10 weight can move through the engine and get to the places that need lubrication better than a heavier grade of oil. A 10-40 grade moves through the engine like a 10 weight oil with the ptotection of a 40 weight oil. If you put a 30 weight oil in your engine, it will not move through your engine as easily and when it does get to the parts that need lubrication, it does not do as good of a job.

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