Didn't all GM cars go CCOT starting in 1977 to replace the expensive VIR unit from '75-'76? And the A6 was still used for several more years after '76, so if those are so susceptible to failure when operated in a cycling application, why didn't we hear about slews of these things failing at an early age? Would have been another GM PR fiasco as the 200C and Olds diesels were...
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