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The only reason, besides cost, that I can think of is the possibility of increased oil leaks. Other than that, no.
As for the double oil change, it's just like in chemistry class when they say to rinse things twice. Yes, you should be removing more contaminants with a double change. Is it necessary? I kind of doubt it unless your engine was really carboned up badly to begin with.
Does it run any better after having used the Chem tool product?
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Scott
'78 SC mit Sportomatic - Sold
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