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The basic premise is this...If the dino oil was abused by being left in too long or using low quality, it could have built up sludge in certain areas of your engine (like the oil pan). If you switch to synthetic, the detergents and additives are stronger and will "wash" your engine free of this sludge. Since that isn't really the desired purpose of the oil, some feel that these flush products can take care of this process. I don't suppose they hurt, but I've never really been convinced how benefitical this is (but I did do it on mine). If you know that the oil was changed frequently, there was a good quality of dino oil used (ie. castrol) then I wouldn't sweat it. Either way, you have gone through enough synth to probably have done this an more.
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