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I have the 4.9 on the left and 4.2 on the right.
Both did not survive the fresh rebuild I did in 2018 The break in oil was really the issue.
I’ve had another set go fairly soon after that.
Finally the 4.9 has settled down, but the 4.2 is not working.
But, ultimately oil and rich burning mixtures are pretty hard on O2 sensors
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