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One more vote for GO5 in our Diesels. I have heard that Diesel engines need the additive that prevents cavitation, and supposedly GO5 has it. My radiator shop tech told me NAPA has the additive, and should be used in all Diesel engines. However, I have seen many OM60X/61X engines with green coolant, and I doubt any have suffered any harm from it's use. Also, I am sure the green coolant of today is better than what was in the cooling systems in these cars back in the 80's when they were manufactured.....Rich
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