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When should I start using synthetic in my rebuilt B230FT? 700

There is no problem changing to synthetic in a factory-new or factory remanufactured engine. The tolerances used in the assembly procedure are such that the engine is generally seated in by the time it comes off the showroom floor. I usually recommend waiting for at least 1500-3000 miles simply to insure that everything was put together properly at the factory.

However, a locally redone engine generally won't be assembled within the same tolerances. In this case, the rings may not seat for a while. Putting in synthetic oil can greatly prolong the seating process, because of the reduced friction. Worst case--some increased oil consumption (maybe for 10-15,000 miles), a more blowby, maybe a bit less horsepower. And the user may then decide that synthetics obviously don't work.






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