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    CDR question - 1988 International S1600 7.3 idi (dump body)

    I bought an old girl, she runs pretty well, but when under load (25,500 lbs) going up and down hills at about 40-50 MPH (speedo doesn’t work) she dumps a lot of blue smoke. I’m wondering of the CDR valve is to blame. When idling or driving lower speeds little to no smoke. The CDR is located in a...
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