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I think the highest temp I have seen is when we drive thu a State Park close to home during the summer heat 95F ish. I would see 208F . It was 10-15 mph for 1.5 miles. Full Air Con and top down. Fans were buzzing so loud it over whelmed the exhaust note.
….I think that one of the rear "auxialiary" radiator is involved with the oil cooler. I think I recall someone ever posted a statement to that effect.
Yep someone posted he added that Middle East car drivers side rad. I asked how it was plumbed and he said in the lines that go to the liquid/liquid oil cooler hoses that are on the drivers side of the engine and would be easy to access. He tracks his C8.