its best to work the engine when seating up the rings. Especially important on diesels, but also on gas engines. Running the mower deck, even if not cutting grass puts a good load on the engine. Run her up to full throttle, if you have a electronic tach, adjust throttle/gov so you see 3600rpm with the mower deck engaged and let her run for an hour or so. That will seat up the rings nicely. Drain the oil while still hot and put in whatever your flavor of normal oil you plan to run.
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