Don't know the p/n but there is also a degreaser for the coolant system the dealer should be using. I would say post headgasket failure, they should be flushing adn degreasing the sytem.
Michael
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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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