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I've dealt with odd fouling in cooling systems where I am currently employed, (an equipment rental business) one of the more unusual was hydraulic oil in the coolant. (produced something that looked like miracle whip ) . One of the best things I've found so far for degreasing/desludging a...

Consider what I've seen evaporust do to gaskets, I'd say no. I've used a GM coolant system flush with good results, but be warned it's nasty stuff. If you have a marginal cooling system, it will make every minor leak into a noticeable one.