The reason the gunk is formed is because the egr lets soot get through the intake. These cars are turbo charged and some oil always gets past the bearings. Throw that oil in with the soot and let it cook for 15 years and you have a nice mess.
Btw euro 603's never had egr's.
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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200
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