Diesels also frequently use EGR coolers, but probably more because of very high EGT.
6.4 and 6.0 Ford Super Duty trucks have had issues with EGR coolers, as they use coolant to cool, and if the cooler fails, engine coolant makes it into the induction system. They have HD replacement options, that you might reference if you decide to build an EGR cooler...
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Current MPG driver:
1994 Isuzu Rodeo - Beater with a Heater...
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