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Engine rebuilding questions. 1980 B21F. 1980

You didn't say that you were going to put new pistons and rings as part of your rebuild. If you are then I wouldn't recommend using synthetic oil during the break-in period for the rings. Use the synthetic for assembly, but use a straight 30W for the breaking in the rings. I tried to use synthetic once breaking in a rebuildt engine and the rings wouldn't seat properly. Had to use 30W oil before the rings would finally seat. After the rings are seated, use the synthetic oil to your heart's content.






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