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Message: [QUOTE="mondtster, post: 883007, member: 13166"] When we break engines in on the dyno they all get JD 10w30 break in oil and are run at light loads with varying speed to start with. The load is increased the longer the engine is run, and it will be making rated power within an hour or so. At that time the engine is considered broken in. The oil is drained after the break in and standard 15w40 is put in it at that point. Normal operation and oil change intervals are used from that point onward. [/QUOTE]

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