You probably had a lot of build up and crap in your system from the old coolant. Good thing everything is leaking now and not 500 miles from home on a trip.

If people just followed the two year changes MB recomends on these cars with the proper coolant a lot of these problems would be avoided. However for whatever reason they don't and ignore the cooling system for years until they start to have problems.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200