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I don't have any experience to draw on, but I would want a bit more information.
When you drained the engine after the previous flushes, how did the fluid look?
Did the fluid drained out after the second flush look very dirty?
Did it look similar to the fluid drained out after the first flush?
If the flush pulls out a lot of crud in the fluid each time I would continue flushing.
If the flushing fluid coming out looks the same as when it went in I would stop flushing.
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